4go takes place on a 4x4 board upon which players take turns placing randomly drawn pieces. The pieces each have 2 colors, one on each side, and players may choose which color to place face up. The object of the game is to create a 4-in-a-row of their own color (warm or cool) or the neutral "void" color. Players may substitute "wild" colors for any of the other colors when forming their 4-in-a-row. Players may also stack pieces onto single pieces that have already been placed on the board, provided the colors that touch "match." The game can also be played in an "advanced" mode where players attempt to score points by forming multiple 4-in-a-rows, scoring a point for each piece of their color involved in the 4-in-a-row. In this mode, pieces can also be moved to adjacent spaces, so long as stacking rules continue to be respected. —description from the sculptor

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