fig1 and 2 illustrate a water column game 20 in accordance with a presently preferred embodiment of the invention as comprising a plurality of identical column assemblies 22a - 22f captured in a vertically oriented parallel and equally spaced array between upper and lower support sections 24 , 26 of a transportable game trailer or fixed park stand . a player water gun 28a - 28f is disposed in lateral alignment with each associated column assembly 22a - 22f for directing a stream of water under control of a player toward an associated apertured target 30a - 30f , each disposed in front of and beneath an associated column assembly 22a - 22f . behind each target 30a - 30f has an associated target switch 32a - 32f ( fig3 and 5 ) that is responsive to impingement of a water stream through the overlying target aperture from an associated gun 28a - 28f for providing an electrical signal indicating that the player at that game station has hit the target . a single water pump 34 ( fig2 ) feeds water from a sump 36 to a manifold 38 ( fig2 and 5 ) common to all column assemblies 22a - 22f . a normally closed solenoid valve 40a - 40f ( fig2 and 5 ) at each game station selectively connects manifold 38 to the open lower end of the associated overlying column assembly 22a - 22f . likewise , a normally open solenoid valve 42a - 42f at each game station selectively connects the lower end of each column assembly 22a - 22f to a common manifold 44 for returning water from all columns 22a - 22f to common sump 34 . a second pump 46 feeds water from a second sump 48 to all guns 28a - 28f , and such water as is captured from the guns is returned by a drain line 50 to sump 48 . pumps 34 , 46 are sized to provide water at identical pressure and flow rate at all game stations independent of player load . each water column assembly 22a - 22f contains a float ball 52 that is buoyant in water . an electronic switch 54 is disposed within a switch housing 55 at the upper end of each column assembly 22a - 22f , and has a switch contact 56 that projects downwardly into the column assembly for contact with the associated ball 52 as the ball is buoyantly raised by water filling the column . all of the column assembly float switches 54 are connected as parallel inputs to an electronic controller 58 ( fig3 ), along with unit - on inputs associated with each game station to indicate that the station is on -- e . g ., that the player has paid to play . when play begins , indicated by an operator reset input to controller 58 , controller 58 supplies power to all target switches 32a - 32b , and simultaneously closes the drain valves 42a - 42f associated with valid or paid play stations . when a target switch 32a - 32f indicates that a player at a particular station is hitting the target , the switch closes and applies power to open the associated valve 40a - 40f . water is thus fed from manifold 38 to the lower end of the associated column assembly 22a - 22f . thus , when a player hits a target , water is fed to the associated column assembly . when one of the column assemblies fills sufficiently to bring the associated float 52 into contact with the associated contact 56 and switch 54 , the signal input from that float switch activates controller 58 to energize an associated player lamp 60a - 60f ( fig1 ) to indicate that that player is the winner of that game round . simultaneously , controller 58 de - energizes all valves 42 so as to drain all columns 22a - 22f to return manifold 44 and sump 36 ( fig2 ). all column assemblies are simultaneously and completely drained . thus , the first player to fill the associated column assembly and bring the associated ball 52 into contact with the associated contact 56 is automatically designated the winner of that game round , and all columns are drained . the game operator may award prizes as appropriate , and reset the game for a new play round by providing an appropriate reset input to controller 58 . it will be noted that each switch 54 is activated by a contact 56 that projects downwardly for contact with ball float 52 . the water in the column never reaches the upper end of the column , and never contacts switch 54 . controller 58 preferably comprises a microprocessor - based controller , although a relay panel controller , solid state programmable controller or other suitable control means may be employed without departing from the present invention . water column assembly 22a will be described in detail in connection with fig4 - 9 , the other water column assemblies 22b - 22f being identical thereto . water column assembly 22a comprises a hollow cylindrical water column 62 in the form of an elongated tube that is open at both ends . the lower end of tube 62 extends through a gland 64 to a threaded sleeve 65 for removable connection to a fitting 66 . the upper end of column 62 opens through a transition union 68 into a cylindrical housing 70 . housing 70 is carried by union 68 coaxially with column tube 62 , being sealed with respect thereto by an o - ring 71 . the diameter of housing 70 is greater than the diameter of column tube 62 . switch 54 and housing 55 removably close the upper end of housing 70 , and float ball 52 is freely disposed within housing 70 , being captured therein by union 68 and switch 54 . the contact 56 of switch 54 comprises a screw that adjustably threadably extends from switch 54 , being locked in adjusted position by a jam nut 72 . housing 70 is surrounded by a sleeve 74 that is captured by an array of threaded fasteners 76 between a pair of opposed cup - shaped elements 78 , 80 . a second hollow cylindrical sleeve 84 surrounds column tube 62 , being fastened at its upper end to union 68 and at its lower end to gland 64 . housing 70 and sleeve 84 are of identical diameter . sleeve 84 provides structural support for column tube 62 . a flat circular enclosure 81 is affixed by screws 82 to upper support structure 24 . enclosure 81 has a lower opening that telescopically receives and holds the upper end of housing 70 and the upper end of element 78 . switch 54 and switch housing 55 are disposed within housing 81 over the upper end of housing 70 so that adjustable contact 56 projects downwardly into housing 70 as previously described . sleeves 74 , 84 , housing 70 and column tube 62 are all preferably of transparent plastic construction . the water supplied to all columns by pump 34 from sump 36 preferably includes a suitable dye clearly visible through the transparent construction of the column assembly elements , and ball 52 is of a coloration that is readily visible through housing 70 and sleeve 74 . in this way , players may readily observe progress of each game round both at their own column assemblies and at the column assemblies of other contestants . the diameter of float ball 52 preferably closely approximates but is slightly less than the inner diameter of housing 70 , so that movement of ball 52 upwardly and downwardly within housing 70 helps scrape any algae off the inside wall of the housing . the reduced diameter of column tube 62 helps reduce accumulation of algae within that portion of the water column . it is to be noted in this connection that water does not enter the space between housing 70 and sleeve 74 , or between column tube 62 and sleeve 84 . thus , algae does not accumulate on the inside surfaces of either of the sleeves . at the lower end of column tube 62 , a coil spring 90 and a washer 91 are loosely captured between gland 64 and fitting 65 mounted on the end of the column tube . a plate 94 has a flange 95 along one edge for receipt within a bracket 96 carried by lower support structure 26 , and an opening 98 along the opposing edge for receipt over a screw 100 also carried by support structure 26 . the central portion of plate 94 has an elongated aperture 102 ( fig9 ) for receipt over fitting 65 and engagement with washer 91 at the lower end of column tube 62 . as the flange 95 of plate 94 is fitted within bracket 96 and the opposing end of plate 94 is swung upwardly over screw 100 , the central portion of the plate is thus received over fitting 92 and engages washer 91 at the lower end of spring 90 . spring 90 is thus compressed against gland 64 so as to urge column assembly 22a upwardly into and against the opening at the lower end of housing 81 . a nut 104 is removably received over screw 100 to capture plate 94 in the position illustrated in fig5 . coil spring 90 thus resiliently urges column assembly 22a upwardly against housing 81 . this resilient mounting of column assembly 22a accommodates substantial vibration as the game is transported between sites without damage to the game components or column assemblies . in the event that column assembly 22a must be removed for maintenance or repair , fittings 65 , 66 are disengaged , knob 104 is removed from screw 100 , plate 94 is removed , the lower end of column tube 62 , sleeve 84 and gland 64 is moved downwardly into lower support 26 until the upper end of the column assembly clears housing 80 . the column assembly is then lifted upwardly and outwardly for maintenance or repair as desired . the column assembly or a replacement assembly may be readily installed by reversal of this procedure . housing 81 has a hinged door 110 that may be unlocked and pivoted upwardly for access to switch 54 and any lamps or bulbs carried within the housing . an important feature of the present invention lies in the ability to adjust the water - fill volumes of the several column assemblies to be equal to each other , so that each player has an equal opportunity to win during each game play . that is , during initial set - up with all housing doors 110 open , jam nuts 72 associated with switch contacts 56 of the several switches 54 are all loosened , and all contacts 54 are adjustably positioned so that all columns take the same amount of time to fill with valves 40 fully opened . this may be accomplished , for example , by measuring the amount of time required for each column assembly to fill , and adjusting switch contacts 56 until all times are identical . jam nuts 72 are then tightened to lock these volume adjustments . it is to be noted that this volume adjustment will remain constant even if one or more column assemblies are removed for maintenance or repair as long , as individual components that may affect water volume are not replaced or recut . thus , during normal operation , it should not be necessary to readjust the fill volumes of the various column assemblies . use of a single pump 34 and a single fill manifold 38 further ensures game fairness by supplying water to all columns at identical pressure and flow rate .