Skout

Enable Cheatmenu:
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Use a text editor to edit the "options.txt" file in the
game directory. 
Type in "options.txt" cheat_keys 1
Type the following Codes during gameplay:  

Code  Result
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A   - All Weapons, Lives, maximal Ammo
F   - Clipping Mode


Level select:
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Note: This procedure involves editing a game file; create
a backup copy of the file before proceeding. Use a text 
editor to edit the "options.txt" file in the game directory.
Add the following lines to unlock all levels:

"ep_solved 15" and "lev_solved 131071".