Is it Tetris, No wait Mario with a little twist of tetris.
The game itself is pretty mediocre for today's standards and you really won't find anything like it in today's modern world of gaming. I thought it was a wonderful relief to the tetris run world of strategy when the game was released in 1990.
It is just so hard not to enjoy helping Mario defeat the little viruses and test your brain until it feels like it is going to fry inside your skull. I would recommend this game to anyone who likes brain teasers, or even the tetris series.
If you haven't played this game or even heard of it you should definitely check it out.