It can get very tiring to load your game of the 1st disc, then switch to the 2nd, etc. but there is a way to avoid this. When the screen pops up that says "Please Insert Disc 2" simply press the Triangle button and you'll proceed without having to change discs. NOTE: You won't see any FMV by playing off of the 1st disc, but you'll still get mission briefings, voices, and everything else.

Enter 'All*cheats*off' as a password.

To get all missions and to see all endings put in this password: "zX7z15EEvLax7Q0N"

Enter 'Commander*Jeffer' as a password.

Enter 'Tranquillex' as a password.

Enter 'Memo*X33RTY' as a password.

Enter 'Hestas*Retort' as a password.