What games have you (re)played the most (and the longest?). On any platform. Ie. Say which games you keep replaying, not just the games that take a long time to complete (unless they are the same). Please include any games, even if other people have listed it in theirs. Some of mine. 1. Super Mario Kart (SNES). Great singleplayer game, where it depends on gameplay not story to hook you + An (even better) two player mode, where you can either deathmatch with strategic weapons (1 hit point removed on impact) and 3 hit points per player. A true classic. 2. Doom: Knee Deep in the Dead (PC) great gameplay, good immersion, a cool atmosphere, the ability to make your own levels. Although I only really played the shareware episode, and my own levels. (full version / Doom2) Yes, there is a point to this.

I beat FF7 two or three times, every time I understood the game more.

Diablo...not multiplayer..just leveling up
granturismo hehe getting better stuff for the cars (leveling up)
xenogears (1st cd only trying to get to where some gears fight like 3-d arena) hehe

Replay value is subjective and very much dependent on the genre of game you like but.......

Replay value for me depends on the game in question offering the following;

1 A complex but once learnt highly intuitive control.
2 A slightly different gaming experience every time you play.

The more control a player can exercise over a game the more they are likely to come back to it.

The second reason means that multi-player games figure highly, I mean, no A.I in the world offers the level of intelligence or on occasion lack of it as other human players, not at the moment anyway.

E.g although not a game that I personally find appealing, Chess is the most replayed game of all time, the reasons for which are due to the two points I have outlined above. The level of control and the different game experiences due to the human factor.

Sorry if that is a little bit theoretical, you may point out that Chess is not CPU game although it has been thrown onto various formats, but I think the point made is still very valid.

No more waffle though, my personal favourites in terms of replay value are;

1 World Class Leaderboard C64
2 Delta Armalyte C64
3 Spy Vs Spy Spectrum
4 Kickoff2 Amiga
5 Street Fighter 2 Turbo Super Famicom
6 Mario Kart Super Famicom
7 Doom PC
8 UEFA Champions League 98/99 PSX
9 Perfect Dark N64
10 Resident Evil PSX

I know the last two titles do not sit happily with my theory, but there are always exceptions to rule.

Please say if it is Multiplayer - SinglePlayer or Both that you are playing in these games. That would be helpful .