Summoner 1&2- probably 5 times each.

Super Mario Brothers - NES, countless times with warp zones, and I could probably count on one hand how many times without them, I was young then :)

Hmmm, I guess all short games like Gradius, R-Type, Ikaruga, Star Fox (and 64), etc. count? Because I've played them all more than 50 times for sure. I've also completed the whole Mega Man saga more than 5 times as well (Mega Man 2 and X, more than 20 times though).

For casual gaming, I have to say I've completed:
- The Legend of Zelda: A Link to the Past more than 10 times already;
- Metroid Prime, around 7 times;
- Metroid Prime 3: Corruption, more than 6 times;
- Metal Gear Solid, around 5 times;
- etc.

But yeah, my most beaten game is definitely Gradius.

Metal Gear Solid 2 - 13 times
Metal Gear Solid 3 - 4 times
FFX - 4 times (perfect save)
FF VIII - 4 times (perfect save)
Ratchet and Clank 2: 6 times
Ratchet and Clank 3: 5 times
Lastly, 2 times on FF VI.

Ah! Completly forgot about pokemon! I think that might be #1 I dont even remeber how many times Ive played through the Red version.

No idea.

Ocarina of Time....24 times. I got the N64, GC collector edition, Master Quest, and the VC version

Uno, dominoes, chess, go fetch, and pull my figure, about 365 time i think.

Duke Nukem & Super Mario 3....

Chess
Solitaire
Minesweeper