Mosaic Quo is a Mosaic set exclusively for four players. It's played the same as the base game, but it has four sets of distinctly colored pieces on the same 7x7 board. Starting with the first player, place your pieces one by one in the empty hole of the game board. If four pieces are lined up in the smallest square shape adjacent to each other, pieces can be placed on them. If four frames are arranged in a square, and three or four of the four are occupied by the same color, the frame of that color is automatically placed on it (apart from the turn). The piece fixed from the beginning to the center of the game board becomes a neutral piece which is not that of either player. When a square containing neutral frames is created, frames are automatically placed on top of the square only if the remaining three frames have the same color. Automatically placed pieces will create new squares, and if 3 or 4 of the squares are occupied with the same color, pieces will be placed automatically as well. In this way, pieces are stacked in a chain reaction. The pieces to be stacked may not only be the pieces of the active player, but also the pieces of the opposing player. In this way, the person who put the piece in turn alternately and who finished all his pieces first wins. —description from publisher