Block Off consists of a playing board, with a plain 8x8 grid, and a bunch of triangular plastic tiles (diagonal cut squares) in white and blue and a single die.Players alternate placing 3 triangles of their color, attempting to complete squares in their color, and patterns of completed squares as well. On a single turn they may ONLY complete squares of their color by playing against pieces already on the board.Which of course means that the game is an instant tie if played symmetrically. (The rules even warn against this.)This mode is ironically enough called 'Thinker Style,' vs the 'Gambler Style' where each player rolls a die to determine how many pieces they can place. This should eliminate ties, but only by replacing them with a large dose of randomness. - BoardGameGeek