A hypothetical

Bad Rats.

quake3

Plants vs Zombies.

The demo version of Savage.

What if it's a multiplayer game? Assume enough other world people to play?
Anyway, it's probably Civ for me. Doesn't need to be Civ5. And I definitely don't need G&Ks.

The first Dead Rising.

Dota 2 seems fine.

CS 1.6

BOI

Chess

That is quite hard.

One of the following:

• Garry's mod

• EVE Online

• Anno

• A Total War game

• CoH

I'm torn on that honestly. One part of me wants to say my favorite game, Sonic 2, since I'd hate to never be able to play again, and since I seem to be able to replay it constantly without being bored. On the other hand, part of me thinks I'd be better off with an Elder Scrolls game because I'd have a huge world to explore with plenty of quests and things to do, NPCs to irritate, the ability to create new player characters and make up my own story lines, etc.

I would choose an mmorpg like WoW, Tera, or even Path of Exile because you can just keep creating new characters.

Warband all the way.

Like play 24/7 or the only game we could ever be able to play?

I'd have to start playing an MMORPG again. With the amount of trivial things you can do in those types of games, it allows many more hours of "gameplay" as opposed to other genres.

Lineage 2 or any MMORPG, im pretty sure that i'll have things to do there

TF2. I've already spent most of my life in that game, wouldn't be that hard to make it a hard 100%

Dota 2 or L4D 2 or old school WoW...

gcc, gives me a few more options

DOTA 2!!!

I don't even play an MMO right now but I'd have to guess WoW, that should keep me entertained for the rest of my life if it was the only game i could ever play.

Age of Mythology, but only if the expansion was with it, need those 12 extra levels.

Skate