It is a variation on hangman. Try to guess the semi-random words while making few mistakes. You lose when one key becomes too damaged. EDIT: You can potentially make up to 52 mistakes before losing, so it's okay make a few guesses at random.
OOOOOOOOOOH, I get what I did wrong. So I would always click ALL of the keys on level 1 for fun and didn't realise that it carries over to other levels. So 80% of the keys were immediately red on level 3 for me, oops.
