Best Replay Value

[Kaabi]

What games do you think have the best replay value? I'll name a few of them by the system (some systems I won't mention).

Nintendo: Mario Bros/Duck Hunt
Nintendo 64: Super Smash Bros., Goldeneye 007, Diddy Kong Racing
Nintendo Gamecube. Super Smash Bros. Melee
Xbox: Halo, Halo 2
Playstation II: God of War
Game Boy Advance: The Mario games

I probably left a lot of stuff out, but I don't even half some of those systems so I didn't have a lot to work with :(

[FallenAngel]

Why leave out PC games? After all, in most countries PC games are on top and there still are many many great games for PC now, and a lot in progress.
I think of all games strategy types have the biggest replay value, but that is just my opinion.

[Peter24]

Surprisingly I often find myself replaying old games, arcade games from years before, card games, but never a real game like RPGs, 3Dshooters, Racing or something else… These I just play once and move on.
So, I’m old-fashioned and replay only old games I remember from my “youth” :p