Letter Rot is a word game about keeping a word alive. You hold a word, like LAMP. Then a letter rots, and you're looking at LOMP. That tile is stuck now. Change one other letter to make a real word again, LOOP perhaps, before the fuse burns out.
Each fix becomes the next word, so your words grow into a chain. The fuse gets shorter the further you go, and after fifteen fixes the words grow to five letters. Let the rot spread three times and the game is over.