If you want more health energy and many super shots, press and hold the "HELP" key when opening a treasure chest. Continue playing normally and when you find another chest, press and hold "INSERT" or "SPACE" when opening it. A golden cross will appear which contains the effects described above.

To skip a level, pause the game and wait 3 minutes! The walls will then turn into exits.

When you find a chest, press "INSERT", wait until the chest is open and release the key. Now press the "HELP" key to get 5000 extra health points!