Big Head Mode forever. It's purely aesthetic, but it was charming.

aah the good old cheat/unlock things..
For me it all started with Commodore 64 and later Amiga 500, remember the whispers among classmates and others about cheatcodes and secrets to certain games.
The best thing was the games that was too hard we kept grinding on but never could finish, and then suddenly we discovered a cheat for these games, in a magazine or on certain "cheat-disks" that had lists of cheats. Then going on with the hard games and finally finished them. Felt so rewarding after all the struggling. Later I began hacking my own cheats with Action Replay MKIII for the Amiga 500, it was truly an amazing thing, since then I've never looked back.. A good game must have cheats/unlocks. Resident Evil series is very good and rewarding the player. My favorite games. :-)

Buy a WiiU or a 3ds then, pretty much every Nintendo game I've play in the past year has had some kind of unlockable modes and extras in it.

There still are unlockables and cheats in games these days. Problem is, you need to pay for them.

As soon as achievements came out cheats died from 99% of games. :(

Huh?,All of today's cheat codes are exactly the same as my credit card number.Maybe just the publishers helping us out?Less numbers we have to keep track of this way.

I miss the Game Genie and Gameshark, used to have so much fun with those, especially using the Gameshark on N64.

Unlockables used to be awesome. Now they just slap a $2-3 fee on what used to be able to be unlocked.

As a big fan of FPS campaigns i prefer a challenge without cheat codes! By the way most FPS campaigns from 7th gen have cheat codes already, hence hiding behind a rock for a few seconds and your health comes back!

I was hoping to see Bioshock on this list but this is a good one!