1993tris by Young K. Chung is surely the weirdest Tetris clone I have ever played. Two by two blocks of flies in different colors glide down. Three flies of the same color in a row or diagonal will disappear. The weird thing is that you get lots of extra blocks: bomb, gun, lighter, magic, and many more. You tend to start out with a gun. The game runs in hi-res EGA and requires a mouse. Registering ($9.95) will get you more levels and five Korean songs for Soundblaster or PC speaker.