Every now and then I watch someone play a game and I get some crazy idea about how to turn it into something the same yet different. I'll admit, it often tends to involve Tetris. ;)
I like to play word-finding games like Scrabble or Boggle, and I like to play Tetris. Now, I can play elements of both game types at the same time! In Wordtris, you have falling Tetris pieces that have letters on each tile. You have to try to make words out of the letters. You can also clear the rows (like in standard Tetris) if you need to make some room.
Wordtris will definitely make you think!