Over the years there have been tons of variations of Tetris and Oggy Mania is one of them.
In this game colored blocks drop from the top of the screen but the point is to line up the same colored blocks (not fill out rows like classic Tetris).
Once you have 4 adjacent blocks of the same color they disappear and the blocks above fall into the hole that was created.
Like with regular Tetris, the game ends when the blocks pile up to the top.
Play the game