Block Artis is a logic game based on the "falling block" model of Tetris. The game starts with a grid filled with blocks. The player makes a move by removing adjacent blocks of the same colour in groups of more than one. When blocks are removed, higher blocks fall to fill their space, and when a column is cleared, the blocks on either side close to fill the gap. The object of the game is to score maximum by removing blocks in groups as large as possible. The score per group is a function of the number of blocks in that group and increase non-linearly with the number of blocks. Since the patterns of blocks above changes when lower blocks are removed, the player must carefully decide in what order to remove the blocks so that the resulting board position after removal of a certain group of blocks leads him into a more favourable board position.
Documentation at http://seeta.in/wiki/index.php?title=Block_Artis