The Lost World

Level select:
Enter MAGICBOX or HUTCHINS as a password. Level selection may be accessed at the options screen.
Information in this section was contributed by Alberto García.

Civil war mode:
Enter CIVILWAR as a password. Two players may fight each other on the same screen.

Alternate hunter uniform:
Enter REDHUNTR as a password for a red uniform.
Information in this section was contributed by Hugo Sjöberg.

Secret messages:
Enter DAVIDHIL or JASONFRI as a password. Each one shows a message and also activates level selection.
Information in this section was contributed by Alberto García.

Immortality:
Enter IMMORTAL as a password. The message "Secret code accepted" will confirm correct code entry. Your character will still lose armor and health, but never dies.
Information in this section was contributed by Leon Deathstorm and Alberto García.

Disable immortality:
Enter MORTAL** as a password.

Glitch: Stuck at menu:
In the Stegos Abduction mission, make a Stegosaurus come close to a cage but do not let it go inside. Kill it and enter the cage when the "mission failed" message appears. The mission failed menu should appear, as well as a glitched block. You will now be able to control your character, but will not be able to use the menu (although pressing Up or Down still changes the selected option). The screen will not follow you if you go out of range. To return to the introduction sequence, either reset the game or wait for a few seconds without pressing any button.
Information in this section was contributed by Alberto García.