These games were also a part of a competition called 140 Bytes, which has been discontinued for quite a while.
The name Tweetris was used by @aemeki because 140 bytes of code can be fitted into a tweet, and the game is like Tetris hence the name. This game has been criticized for not being accurate or the complete Tetris. However, it is still something to fit such a complex game in under 200 Bytes. It also shows your Highscore, which is a nice feature. Another thing to note is that this game can be decreased in size but at the cost of features. As this game was restricted to the size 140 thus it is the smallest in size and almost complete Tetris game.
Game of Life