Tricky 6 is an unofficial iPhone implementation of the board game Qwirkle, with a different scoring mechanism.
As in Qwirkle, 2-4 players (human and/or AI) place tiles with 6 different symbols in 6 different colors on the table. Each line must consist of either the same line or the same color. Moreover, each tile in a color line must have a different symbol, and each tile in a symbol line must have a different color.
In contrast to Qwirkle, players in Tricky 6 score for EACH tile they place. So adding the first tile to a pre-existing one scores you +2; adding an additional tile to that line scores you +3; and so on. Completing a row of 6 tiles scores you a bonus of +12, in addition to all of the previous cumulative scores.