If you don't know what a Rougelike is:
- RPG
- Randomized dungeon floors, loot, and monsters with increasing difficulty.
- Depending on the choice of the player, you can have a set number of floors or infinite (infinite would probably end up being hardcoe mode).
- NPC owned shops to sell loot and buy supplies, enchanting equipment, some mindless kill quests and slap a few wenches for that next challenging set of floors.
- Pretty much the RPG that keeps on giving.
This way, the player can play with friends, keep a game running and not necessarily mess up their single player experience everyone is so worried about. And it would still be a pretty solid single player mode to dabble in when you want to just smash, stab, and blast enemies all over the ground. No you're not going to have too many unique things going on, because it would be a small rougelike expansion. But it would still be some pretty good mindless fun, that would definitely keep people playing the game longer.