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- D.I.J.'s identity
The person who wrote the D.I.J. diary is Alfred Ashford's butler. You can find this out by reading the butler's letter found in Claire's section of Antarctica.
- D.I.J.'s journal
You find D.I.J.'s journal in the slot machine in battle mode. Sometimes you have to play more than once to find it.
- D.I.J.'s REAL identity
Read the D.I.J. journal carefully and you'll find that D.I.J. is really a mouse! Pay attention to when Claire Gets trapped by the shudder just before Alfred talks to her on the intercom. And, the mouse in the locker on the antarctic base? D.I.J. Is NOT the butler. Did you see a butler in the cargo plane? Nope.
- First Person Mode
To attain the first person mode, beat the game in easy or normal mode.
- Get the rocket launcher
To obtain the rocket launcher (NOT the linear launcher which is the weapon used at the end of the game) finish the game with a rank S. To acquire an S ranking, you CANNOT save and retry (basically you cannot die or reset the game at anytime) and you CANNOT use health canisters to heal yourself. You must also give the black man at the start of the game the antitoxin and you must save Steve quickly when he takes the golden guns in disc 1. Also you must finish the game within 5 hours.
- Infinite ammunition ( demo )
Enter the item selection screen, then press Up, Up, Down, Down, Left, Right, R.