Tisbyis a word game, sort of a cross between Scrabble, Alfred's Other Game, and Boggle, with luck removed.
Each player has their own set of tiles. A group of letters are randomly determined (by dice rolling versus a table) and each player starts with the same letters. Each player has their own 7x7 grid and a player screen to hide their boards from others, and tries to create the best score. Words must be connected a la crossword puzzles, with the same set of letters everyone else is working with. The first player done starts a timer, which the other players have to race against. A game lasts six rounds.
Two alternate difficulty levels are provided: novice, in which the three easier rounds are placed twice each, and master, in which the three harder rounds are played twice each, with some additional rules.
The second edition of the game changed the scoring rules significantly.