Press 1, 2 or 3 to set difficulty level. Press the keys corresponding to the letters before they reach the bottom. 1 point for each correct letter, -1 for an incorrect letter and -2 if the letter reaches the bottom. Have fun!
Thanks to Mhart for the original project - it was great except for one thing. It was missing me! The @. Also thanks to @griffpatch for the special 'key @ pressed' block.