Emil Hall (who uses the handle el Hamil) originally programmed Tetrist for DOS in 2000. This version is unfortunately nowhere to be found any more.
Tetrist is probably the graphically most bizarre Tetris I've ever played. The irregular lines sometimes make playing a bit difficult.
Tetrist was programmed with Allegro 4 and needs the alleg40.dll to run. Put it into your system32 folder, and you'll never have to worry about it again. Tetrist can take screenshots (press P) that are saved as scrdump.pcx in the game directory, but only one at a time, the next one will overwrite it again.