a first embodiment of the invention will be described in terms of a printed instant ticket with a scratch - off material covering play indicia . fig1 is a simplified representation of a conventional instant lottery ticket 10 that includes a printed identification 12 of the ticket 10 , a printed instruction 14 on how to play the ticket and a scratch - off material 16 covering a set of play indicia 18 . also , printed on the lottery ticket 10 is a set of validation data 20 that can be in alphanumeric or bar code form or both . the validation data 20 can be printed on the back of the lottery ticket 10 as well . in the representation of fig1 , the lottery ticket 10 is shown with most of the scratch - off material 16 removed which , in this case , reveals the play indicia 18 that indicates to the player that the prize value of the lottery ticket 10 is $ 100 , 000 . 00 . in conventional instant lottery games , the tickets 10 are all printed with play indicia 18 that indicate the prize value of the lottery ticket 10 . fig2 is a simplified representation of an instant lottery ticket 22 according to one aspect of the invention . the principal difference between the lottery ticket 22 and the conventional lottery ticket 10 is that a set of play indicia 24 printed beneath the scratch - off material 16 on the lottery ticket 22 represents a variable prize value as indicated on the lottery ticket 22 by a coined term such as “ mystery prize ” as shown in fig2 or “ bonus prize ”. here , the play indicia 24 also includes a message to the effect that the player should read instructions ( not shown ) on the back of the lottery ticket 22 that will provide guidance on how to redeem a prize for the lottery ticket 22 . in the preferred embodiment of the invention , most of the lottery tickets in the game will be printed with play indicia representing the actual value of prize as shown at 18 on the ticket 10 in fig1 . additionally , and evenly dispersed throughout the game , will be a set of the lottery tickets 22 having the printed play indicia 24 indicating a variable prize value . these tickets 22 will be dispersed evenly throughout the game and , preferably , in such volume to greatly increase the likelihood that at least one of the “ mystery ” prize winning tickets 22 remains in the game at all times . in this embodiment of the invention , it is desirable that the odds are extremely high that at least one of the “ mystery ” prize ticket 22 remain in the game after the last static top prize is sold . if the last static top prize as shown at 18 on the ticket 10 is redeemed for cashing before all tickets in the game have been redeemed , at least one of the remaining ‘ mystery ’ prize tickets 22 would be eligible to be ‘ promoted ’ to the top prize . this “ mystery ” top prize would be distributed during the end of game draw procedure . in this manner , it would always be possible to win one of the top prizes as advertised by the lottery administration in its general promotional literature , and thus render moot any complaint that the top prize no longer remains in the game . it is common practice that drawings of this type are conducted by a manual process whereby players mail in to the lottery a stub or some portion of the ticket . in the preferred embodiment , this manual system is replaced by an electronic system reducing the workload on the lottery and reducing the chance for fraud or error . with reference to fig3 , operation of the preferred embodiment of the instant lottery game will be described . to illustrate a representative environment for the invention , fig3 provides a block diagram of the basic hardware structure of a typical state administered lottery system 26 for selling and redeeming instant lottery tickets such as lottery tickets 10 and 22 . included in the system 10 is a lottery ticket redemption mechanism which in this embodiment can include a number of validation or agent terminals 28 a – c that are connected , as represented by a set of lines 30 a – c , to a lottery host computer 32 . the agent terminals 28 a – c usually include bar code readers , keyboards , displays and printers that a lottery agent can use for selling , validating and redeeming instant lottery tickets . the connections 30 a – c to the host computer 32 can be dedicated or dial - up telephone lines or other methods of communication such as satellite communications systems . included in the host computer 32 is a validation file 34 that contains validation information for lottery tickets usually stored in the form of records each having a ticket identification and a prize code as represented generally at 35 as shown in fig4 . the prize code can be a code or the actual prize or redemption value of the lottery ticket 10 or 22 . usually there is one record 35 for winning lottery tickets that requires validation through the host computer 32 . however in some cases , the validation file 34 contains records 35 for only the winning lottery tickets in a game or contains records 35 for all of the tickets in the game . connected to the host computer 32 is a lottery administration terminal 36 that usually contains or is connected to a data input device 38 such as a compact disk ( cd ) reader along with a printer 40 for printing out reports to the lottery administration . also in some state lotteries , the lottery administration provides information to the public via an access system regarding the status of a game by , for example , a toll free telephone number as represented by a block 42 and , or in some cases , by internet access represented by a block 44 it is typical practice in the united states lottery industry for a ticket vendor to provide a state lottery administration with one or more sets of tickets where each set is defined as a game . each game will normally have a prize structure with a predetermined number of winning tickets and a predetermined number of losing tickets . very often the winning tickets are divided between high tier winners , which have a high winning prize value and low tier winners that have relatively low winning values . it is also industry practice for the vendor to supply the validation file 34 for each game , which is generally structured to contain one record 35 having the prize code for each winning ticket in the game . in conventional game structures , the prize value represented by the prize code in each record 35 provided by the vendor is fixed or static . for some games , the validation file 34 will contain a record 35 for each winning ticket or in some cases , the validation file 34 will contain a record 35 for each lottery ticket in the game . this vendor supplied validation file is then loaded into the host computer validation file 18 using the data input device 38 . in many state lotteries the practice is to require that high tier lottery tickets that are presented by a player to a lottery agent for redemption be validated by having the lottery agent transmit ticket identification information or the validation data 20 from the agent terminal 28 a to the host computer 32 . this information is then used to access the record 35 in the validation file 34 that contains the prize code or redemption value for the lottery ticket 10 and this value is then transmitted back to the agent terminal 28 a . the usual practice is to have the lottery agent compare this value from the host computer 32 with the winning value 18 printed on the lottery ticket 10 and if they are the same , the agent will pay the player this amount or provide the player with a form that he can use to redeem the ticket from the lottery administration . referring to fig4 , in one embodiment of the invention , an instant lottery game structure is provided where a subset of the lottery tickets , such as the lottery ticket 22 , is printed with the play indicia 24 which indicates to a player that the prize can have a variable value . the rest of the lottery tickets in the game , such as lottery ticket 10 , are printed with play indicia 18 that have a static prize value and for a large number of the lottery tickets 10 the play indica 18 will indicate that the lottery ticket 22 has no redemption value . in the validation file 34 , the first set of records 35 corresponds to the lottery tickets 10 that have static prize values and a second set or a sub file of records 45 corresponds to the lottery tickets 22 that have variable prize values . other methods that identify the variable prizes within the ticket population in a game can be used as well , such as a special prize code unique to variable prize tickets . in the preferred embodiment , the initial prize values represented by the prize codes in each of the records 45 in the sub file will have the same relatively low value , for example $ 50 . 00 , at the beginning of the game . for other embodiments , each initial prize code can have a different value or even a null value . here , the $ 50 . 00 value represents the prize value that the lottery tickets 22 in the sub file 45 can be redeemed for , at least at one point , during the time period that the game is being marketed to the public . in addition , the host computer 32 can automatically at periodic intervals change the prize values in the records 45 in the validation sub file . these changes can be random within a certain predetermined range or alternatively , the changes in the prize values can be made by the host computer 32 in response to inputs from the lottery administration via the terminal 36 . for example , the lottery administration can , by using this system , alter the redemption value of the variable tickets 22 to increase ticket sales or as a part of its marketing plan as it relates to a specific dynamic prize structure for the game . the host computer 32 will mark as paid the records 45 in the sub file that represent lottery tickets 22 that are redeemed during the game period . then , preferably at a publicly announced date after the termination of the game period , the host computer 32 would perform an electronic draw based on all or a subset of the records 45 in the sub file to determine the winner of the final top prize in the game . alternatively , the system could be used to distribute all remaining , unredeemed prizes in the game among those players who hold a ‘ mystery ’ prize winning ticket 22 . if , for example , there were one thousand records 45 in the mystery prize sub file and the lottery administration wished to distribute one hundred high tier prizes that remained in the game , the electronic draw program in the host computer 32 would randomly distribute those remaining prizes into the one thousand records 45 in the sub file . normally , the lottery administration would establish the total prize payout before the beginning of a game . one of the primary advantages of the system described above is that , the lottery administration will know what the total payout for a game is while at the same time because a portion of the prizes are dynamic , it will have the ability to control the amount and timing of certain of the redemption values for the lottery tickets 22 . because security is an important factor in lotteries , it is desirable that the systems such as 26 shown in fig3 , and the file structures such as the validation files 36 and the sub file 45 shown in fig4 along with administrative procedures utilize the latest security technology . preferably , only authorized lottery administrative personnel should be able to dynamically modify the value of the lottery tickets 22 . one approach is to use the audit techniques described in u . s . patent application ser . no . 10 / 317 , 577 , assigned to the assignee of this application and which is hereby incorporated by reference . for example , the approach described in this patent application of using a read only memory to check the total prize value of a game can be used to test the integrity of the records 45 in the sub file . the following is an example of how the game structure described above might operate . after purchasing the lottery ticket 22 , the player scratches off the scratch - off material 16 . if the play indicia 24 indicates that the lottery ticket 22 has a variable redemption value , e . g ., the “ mystery prize ”, the player , depending on the rules of the particular game , will have the option to : ( 1 ) redeem the lottery ticket 22 for its current value and / or ( 2 ) be included in the end of the game prize drawing . in one embodiment of the invention , these two options are mutually exclusive ; in another embodiment , the mystery prize winner is automatically entered in the end of game draw , regardless of whether he has redeemed his ticket . the redemption value of the prize during the game period can be , for example , $ 50 during week 1 of the game , $ 100 during week 2 , back to $ 50 during week 3 etc . . . . as described above . in this example , the players can learn the redemption value of the lottery tickets 22 during the game by utilizing the internet 44 or the 1 – 800 number 42 . the players who opt to remain in the final draw held at the end of the game can likewise learn the value of their lottery tickets 22 via the public access system such as the internet 44 or the 1 - 800 number 42 . at any time until the game is closed , a player can redeem his mystery ticket for the current posted value . in one embodiment , if he chooses to remain ‘ in the draw ’, his mystery prize ticket 22 is guaranteed to be of some minimal value . if he opts for the draw , he might win the top prize or some other high - valued prizes such as a car or a trip . alternatively , the player might win some sort of relatively low value promotional item such as a t - shirt promoting the lottery . in another embodiment , the player can both redeem his mystery prize for its current value and expect to be included in the end of game draw . yet another embodiment of the invention will be described in terms of an electronic ticket with a simulated scratch - off material covering play indicia . in particular , a set of dashed lines 46 in fig1 and 2 represent a display of a video lottery terminal or a personal computer that can be connected to the host computer 32 to play an electronic version of an instant lottery game . here , the lottery tickets 10 and 22 are electronic visual simulations of instant lottery tickets where the scratch - off coatings 16 can be removed by the player by operation of a mouse or some other control device connected to the terminal . again , fig3 depicts in block diagram form the basic hardware structure of the typical state administered lottery system 26 that can be used for selling and redeeming electronic lottery tickets such as lottery tickets 10 and 22 . included in the system 10 are a number of video lottery terminals 48 a – c that can be for example video terminals in a gaming establishment or player owned personal computers . the video lottery terminals 48 a – c can be connected , as represented by a set of lines 50 a – c , to the lottery host compute 32 by a variety of mechanisms such as the internet or a lottery site controller 52 which in turn is connected to the host computer 32 . the video lottery terminals 48 a – c , as represented by the terminal 45 a in fig3 , can include the graphical capabilities such as the display 46 for a lottery player to the play the electronic tickets 10 and 22 and a reader 52 for receiving credit cards or coupons to permit the player to play the game . also , a printer 54 can be included or connected to the terminals 48 a – c for printing out a payment voucher such as an eticket 56 having for example a bar code 58 that can be used by a player to redeem a winning ticket at one of the agent terminals 28 a – c . it should be noted that a variety of redemption mechanisms can be used including various internet secure payment systems . to enable a player to remove the simulated scratch - off coating 16 , a control device 59 such as a keyboard or a mouse can be used with the video lottery terminals 48 a – c . this system permits a player to pay for and play electronic tickets as well as ‘ cash out ’ when finished . the connections 50 a – c to the host computer 32 can be dedicated lines , dial - up telephone lines or other methods of communication such as satellite or internet - based communications systems such as shown at 44 . as with the printed instant lottery games discussed above , it is typical practice in the united states lottery industry for a ticket vendor to provide a state lottery administration with one or more sets of “ electronic ” tickets such as lottery tickets 10 and 22 where each set is defined as a game . each game will normally have a structure with a predetermined number of winning tickets and a predetermined number of losing tickets . very often the winning tickets are divided between high tier winners which have a high winning prize value and low tier winners which have relatively low winning values . it is also industry practice for the vendor to supply the validation file 34 for each game , which is generally structured to contain one record having the redemption or prize value for each high tier winning ticket . in conventional game structures , the prize value in each record provided by the vendor is fixed or static . for some games , the validation file 34 will contain a record for each winning ticket or in some cases ; the validation file 34 will contain a record for each lottery ticket in the game . this vendor supplied validation file is then loaded into the host computer validation file 18 using the data input device 38 . in many state lotteries the practice is to require that the high tier lottery electronic ticket vouchers that are presented by a player to a lottery agent or a lottery validation system for redemption be validated by having the lottery agent or system transmit ticket identification information or the validation data 20 from the agent terminal 28 a to the host computer 32 . this information is then used to access a record in the validation file 34 which contains the redemption value for the lottery ticket 10 and this value is then transmitted back to the agent or validation terminal 28 a . referring again to fig4 , in one embodiment of the invention , an instant lottery game structure is provided where an electronic lottery tickets , such as the lottery ticket 22 , is displayed on the display 46 with the play indicia 24 which indicates to a player that the prize can have a variable value . the system 26 then functions essentially the same way the printed instant lottery system functions as described above . the following is an example of how the electronic instant lottery game structure described above might operate in one embodiment of the invention . after selecting and purchasing the electronic lottery ticket 22 at the video lottery terminal 48 a , the player receives a graphical representation of his selected ‘ pull ’ or ticket 10 or 22 . if the play indicia 24 indicates that the lottery ticket 22 has a variable redemption value , e . g ., the “ mystery prize ”, the player will have the option to : ( 1 ) redeem the lottery ticket 22 for its current value or ( 2 ) opt to be included in the end of the game prize drawing . the redemption value of the prize during the game period can be , for example , $ 50 during week 1 of the game , $ 100 during week 2 , back to $ 50 during week 3 , etc . . . . as described above . in this example , the players can learn the redemption value or any other value or non - value of the lottery administration &# 39 ; s choosing of the lottery tickets 22 during the game by utilizing an information access system such as the internet 44 , the 1 - 800 number 42 or , in this case , the video lottery terminals 48 a – c . the players who opt to remain in the final draw held at the end of the game can also learn the value of their lottery tickets 22 via the internet 44 , the 1 - 800 number 42 or the video lottery terminals 48 a – c . at any time until the game is closed , a player can redeem his mystery ticket for the current posted value . if he chooses to remain ‘ in the draw ’, his mystery prize ticket 22 is guaranteed to be of some minimal value . if he opts for the draw , he might win the top prize or some other high - valued prizes such as a car or a trip . alternatively , the player might win some sort of relatively low value promotional item such as a t - shirt promoting the lottery or nothing . in another embodiment of the invention , the player can both redeem his electronic mystery prize for its current value and expect to be included in the end of game draw . the existence of mystery prizes tickets 22 within an instant ( or an electronic game ) and the mystery prize validation sub file 45 delivered to the lottery administration can form the basis for the electronic end of game ( or end of sales ) draw . the validation numbers 20 of the mystery prize winning tickets 22 are separately stored in the validation sub file 45 ( or in another embodiment , a special prize code identifies the mystery prize winners in the traditional validation file 34 .) in either case , the electronic draw is based on these validation numbers 20 which uniquely identify the population of all mystery prize winning tickets within the game . valid or redeemed mystery prize winners within a game can be further identified by a voucher that is produced at the agent terminal 28 a upon redemption of the mystery prize winning ticket 22 . at this point , player information can be recorded in a database . alternatively , the internet 44 or a 1 - 800 number 42 can be used to identify validated mystery prize winners . there can be other methods of identifying those lottery players who have indeed won a mystery prize . the result of the identification is to populate or mark the validation sub file 45 with valid mystery prize winners who are eligible for the electronic drawing . by the methods described above , once the lottery has satisfactorily populated the validation sub file 45 with valid mystery prize winners , the lottery can choose one of the records 45 from this file . typically , this would occur at some predetermined point in the lifecycle of the game , for example the end of retail sales for the game . the selection of this single record 45 can be accomplished using several common methods , but the most common is the use a specialized random number generator by the host computer 32 . this random number generator would identify one of the mystery prize winners as the grand prize winner — and thus distribute the remaining top prize in the game to this individual mystery prize winner . since mystery prize tickets 22 are available throughout the sales of the game , all lottery players will have the opportunity to play for the top prize until the game sales have been halted by the lottery administration . it will be understood that the dynamic game structure concepts described above can also be applied to non - gambling games . as an example , this type of structure can be used with supermarket type sweepstakes where sweepstake coupons are not sold .
in an instant lottery ticket game structure having a lottery administration host computer that includes a ticket validation file containing prize codes for at least some of the lottery tickets , provision for instant lottery tickets having variable redemption values can be made by allowing the prize codes in the validation file to be changed under certain predetermined circumstances . at least some of the lottery tickets in the game , whether printed or electronically simulated , can be provided with play indicia under a removable coating that indicates that the redemption value of that lottery ticket is variable . using the host computer , a lottery administration can change the prize codes and therefore the redemption value of these instant lottery tickets according to the predetermined criteria such as the termination of a game . in some cases , a player can have the option to redeem an instant lottery ticket for a first value or wait until after termination of the game where a possibly higher redemption value might be assigned to that ticket due to the host computer randomly selecting that ticket to change its prize code to a greater value .