This is Joe Larson, the author of the game. No seriously. It's me.
I wanted to correct something in the previous review. The game isn't DOS. It's windows. If you try to run it in DOS... well, I'm not sure what will happen. Either way this is compiled for windows. It's just a console app, which I guess confuses some folks.
That review also failed to mention the dangerously addictive nature of the game. Since lines clear so frequently the rewards come quickly. It's not unusual to get 100 lines cleared in a 5 minute game... if you make it that far.
Another thing to note is that the only sound in the game is the default "bing" when you clear a line. Personally I like to change what sound plays in control panel so that I don't get bored with it.
So, yeah. Glad you like the game, and it looks like you've got the most up to date version, so that's good. It's got a plug for my site, Cymon's Games, where I've got a number of other games, not all by me, and not all this good... or bad.
In another remake of Tetris, you have to... stack blocks. Really, if it has to be explained to you at this point, then you should stop trying to like games and move on to something else. Tetris is Tetris, end of story.
This version happens to have been implemented in DOS, is open source and has limited movement available. Yes, there are only four vertical columns of movement. This automatically makes the game trickier, but also causes the humorous side-effect of when you get a straight piece, turn it sideways and it creates a line all by itself and as a result - promptly vanishes.
There is little else to differentiate this from any other game of the same ilk. Its levels continue upward with a different colour for each screen. Your score is also saved. Apart from that, its really just another standard Tetris variation. Nothing extremely exciting.