Stage Select:
On the Game Selection screen, hold Ctrl+Shift+Q+W, then let go of W. This will access stage select mode.

Cheat Mode:
During gameplay hold Ctrl+Shift+S+X, then let go of S. This will give you a red cursor at the bottom of the screen. Type the
following to enable the cheat...

Code              Cheat
Raggsdale         get complete cheat menu
Kill              kills selected enemy
Egg raptor        gives raptor egg
Egg trex          gives trex egg
Egg stegosaur     gives stegosaur egg
Egg dilo          gives dilocosaur egg
Egg triceratops   gives triceratops egg
Egg compy         gives compy egg
Egg parasaur      gives parasaur egg
Remdul            get Alien with a big gun
Health            recover health
Win               instantly completes mission
Lose              instantly loses mission
Jurassic          reveal map
money#            gives you supplies.  # is the number of supplies you want

Alex Hofstad and David Hurse