bookworm be a straightfoward d game . all you have to do be select a letter on the screen and form a word by tap a letter adjacent to the last . you earn point base on the length of the word , bonus denote by the color of the letter 's tile , etc. . what set bookworm apart from other word finding game be that occasionally -lrb- or in one mode constantly -rrb- a letter 's tile will catch on fire . a tile on fire will burn through tile 's below it and if it burn through the bottom of the screen , it will `` set the library on fire '' and end you game . while this sound fun at first , it quickly wear out . play in the main mode , my first game take about half a hour and while it be a half hour of fun , I have have to force myself back to play the game since . the concept just tire too quickly . one feature that give the game a little life be the collection of 20 secret book . each secret book contain a dozen or so secret word with a common theme range from pet to emotion . once you form a word in a secret book , you 'll be able to see all the rest of the word in the book . form all the word in a book and you get extra point . the presentation of the game be charming overall . the control work well and the music be okay . however , nothing can make up for a flawed game design . the main mode ramp up the challenge way too slowly . the main mode need more structure and variety . it need clearly define and seperate level , rather than merely a summary of point score and a picture of a new room fill with book . there be little feeling of advancement or reward for play a lengthy and high-scoring game . it seem that the ` action ' game mode try to address the turtle 's pace erring of the main mode , but end up be even less fun . despite my loss of interest in Bookworm , I recognize that many will find the game appeal for a longer period of time . while the occasional casual game , like peggle , manage to get I temporarily hook , I be mostly immune to the feverous addiction to spider solitaire , freecell , etc. that seem to plague most casual game fanatic . I can see this be the type of casual word game that could easily hook the right type of person .