CRTetris

CRTetris is a Tetris like game. The game has 22 levels, each one being more difficult than the previous one. To finish each level, you must clear a certain amount of lines, just like the original Tetris. You get points for placing blocks, clearing lines, and extra points at the end of each level. The scoring system is identical to the classic Tetris; you get more points at higher levels, more points when you drop the blocks fast, etc. When a level ends, the board clears and you go to the next level. Each level has it's own background. In the original theme (a theme is a collection of background art and/or music; you can use another theme or even create your own) you travel around the world, from Canada to Antarctica. At the end of the game, if your score it high enough, you get in to the high score table.

For a while it seemed like CRTetris would be the last Tetris clone ever designed for DOS, but then Ben Hanke's TinyTris came along. But if it isn't the last, it's the most lavish for certain: It is skinable and runs in 640×480 tru-color, download size is over 2MB. Unfortunately the default skin is not very attractive, and there is only one alternative.

On my main PC, CRTetris would not display correctly, I don't know if due to XP, the graphics card, or processor speed. It will play in DOSBox however.