Unlock 1980's Skin
At the main menu, select "Extras", then "Cheats", then input the following code as a password NAILGUN.

Unlock 1990's Skin
At the main menu, select "Extras", then "Cheats", then input the following code as a password WOODCHIPPER.

Unlock 2000 Skin
At the main menu, select "Extras", then "Cheats", then input the following code as a password CEILINGFAN.

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