Challenge mode levels:
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At the title screen, press Down, Up, Left, Right two times, Left to unlock four
Challenge mode levels. If you entered the code correctly, you will hear a sound.
Expert and Impossible modes:
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Successfully complete Chapter 10: „Secrets And Salvation” to unlock the Expert
and Impossible difficulty.
Switching weapons:
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Normally you cannot change weapons except by picking up new ones. To access the
weapon selection screen, quit the game, exit to the main menu, then resume the
level. Note: You will only have the default amount of ammunition for the
selected weapon and lose your previous stock. You can only choose one weapon,
and will lose the other two special weapons.
