As a teenager I started various DOS game projects. Among those games was a Bubble Bobble clone called Bubble Mania, a platformer game based on an old C64 game called Mystery (which itself was a Giana Sisters Clone), a four player medieval Bomberman kind of game, an attempt to make a Castlevania like Action Adventure and of course a Tetris clone.
More videos can be found on youtube
the Tetris game was the only one that I finished
on all other projects I ran into either memory or performance issues, then I started a new game :D
my Tetris was also featured on the CD of a german games magazine called GameStar
I didn't know that the exe file was virus-infected (and GameStar neither), so it spread across germany thanks to the CD