Brain and Puzzle; a beautiful "simple" game available on Android; once played the complexity is soon realized. This new 21rst century game (original with the authors) is worthy to be called an upgrade to Tic-Tac-Toe, ALL games end up in a decisive result. Deduce is implemented with multiple levels so all players can enjoy. Deduce is NOT a "shoot'em up" / fantastic graphics game, it is a game worthy to be included in a list of classic board games such as Tic-Tac-Toe, Qubic, 4-In-A-Row, Mastermind, Checkers, Chess. See the YELLOW & BLACK icon, available December 2011.