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When you open a treasure chest hold down the ‘HELP’ key, then when you open a second chest hold down the ‘INSERT’ key. A golden cross should appear, collect this and your health points should rise by 50,000. You will also have super shots for the remainder of the level.
To avoid tricky levels, pause the game and wait for three minutes. Press fire and all the walls turn to exits. This happens anyway, but if you pause the game, you don’t lose energy, and won’t get attacked while waiting three minutes.