New Game +

[cbu]

Feature to reset the map and game but retained the characters and their items. Should be extremely easy to implement.

Have to download the unofficial game reset utility for the original wasteland... Kind of sad.

[praguepride]

This is always a great way to increase replayability as a game. Allow someone to take their now super-powered characters and explore the previous sections of the game in a new way.

This introduces the ability for speed runs, power levelling, and just straight up fun and enjoyment as you 1-shot kill the bosses you struggled with previously.

Dead Rising does this great by having not only your character retain between play-throughs, but allowing you to unlock ridiculous weaponry in those playthroughs to make even further replays even more "fun"

Megaman blaster..yeah. You had to earn it but it took the game to a whole new level.

[BentSea]

Every game that I've loved that has had this feature... I have just loved all the more.

[Drool]

The only reason anyone needs to download that utility is because all the rereleases of the game (which are the ones on the "abandonware" sites) didn't include the reset utility. The original had one, and it worked quickly and efficiently.

[hiptanaka]

If we're going there, NG+ should also throw in a couple of surprises. Like some ridiculous, close to impossible fight in some unexpected place.

[BlackGauntlet]

And different endings.