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Underrated feature in games: Fake desktops/PDAs.
(sh.itjust.works)
Bonus points if they are super retro ideas of the future internet like in front mission 3.
Can't get enough of this. I remember really loving the fake DOS mode that Enter the Matrix had. You could unlock cheats for the game or look at little hidden videos and things. It was fairly elaborate for a little gimmick.
Memory unlocked. Though using cheats through that most certainly crash the game, you just didn't know when it would happen. I remember using infinite ammo with the smoke grenade gun like halfway through before the game finally crapped out