Kollon is a puzzle game where the player rotates a two by two section of blocks to match similarly-colored blocks, and blocks can be cleared from the board if at least four blocks of the same color are touching. When blocks are cleared, blocks above them fall down, which may be used to make combos which award more points. As the game progresses, new rows of blocks will push up the current ones, getting faster as the game increases in difficulty. Not clearing enough within a set time limit will force the blocks to the top of the screen, where the player will lose. The speed of new rows will increase as the game is played longer. The game offers several different modes including a multiplayer and arcade mode.