[bitwize]

> I've played something like 1500 hours of Overwatch that I bought for $30. The depth of the game is just spectacular, and it keeps you coming back to play more. They add new heroes and new maps regularly. The core game itself is fun. I've made many friends. I met my girlfriend in that game.

A lot of people could say many of the same things about Nethack -- or MUDs. Neither of which are business-card-sized, but they're closer to that extreme than to the AAA extreme.

[nearbuy]

Currently at about 200,000 lines of code, I'd say Nethack is much closer in size to the AAA games. Doom 3 was only about 360,000 including the engine.