MU Helper - in-game help system. it is built into the game and it works even if the game window is minimized.  MU Helper has an additional interface window, which is always located at the top of the screen.  the green notebook - hunting log the red sprocket - mu helper settings (also activated with keyboard letter z) yellow play button - start MU helper. (also activated with keyboard button home or wheel-click ) number from 1 to 5 - stage. above it al