What is Your Favorite Game of all Times

Space Rangers 2: Reboot (Available on Steam for $10). Still lot of fun playing it nowdays.

Freelancer;
Mafia;
Republic Commando;
RTCW;

They all hold a special place in <3 (together with portals i mentioned earlier).. I might remember more..

Outlaws..

The Elder Scrolls III: Morrowind

EarthBound.

Hey, it WAS released in 1995 in the US.

So many possible answers but at the moment I am entirely addicted to The Binding of Isaac and it looks like it will be that way for a while.

Though my not-currently-obsessed-with answer which is probably more accurate would be, probably, FF: Tactics or Kings Field for PS1 (KF1 here, but it was KF2 in Japan, I believe).

Either Psychonauts or Planescape: Torment. It's a tie.

Wolfenstein 2010! :D

Red faction (1999), Minecraft, Battlefield 3

Uhh... Can't choose only one. So... The Neverhood, Space Rangers 1-2, Fallout 1-2, Zanzarah, Heroes of Might and Magic 3, The Sims 1 (yea, rly), Age of Empires II and Age of Mythology... As for new games, Assassin's Creed 2 was really nice. And of course it's Minecraft and Terraria.

Baldur's Gate Saga

Star Wars: Knights of the Old Republic.

Deus Ex (1)

TES III: Morrowind

Metal Gear Solid 1,2,3,4 & Syphon Filter 1,2,3 Ps1 & Counter-Strike

If I had to choose only one: Baldur's Gate II Shadows of Amn.

MW2 and TF2.

Crash team racing :DD

killer instinct (Snes) is the best...

chrono trigger.

Mass Effect series

Ratchet and Clank :) first game

Metal Gear Solid franchise/Shadow of the Colossus/Ico/Okami/Professor Layton franchise

Choose one for me

I really want to be able to answer this, but it's just impossible for me to pick a single favorite game, favorite series, or even a favorite genre of games.

The closest I can get to picking a favorite is a tie between the following series: Kingdom Hearts, BioShock, Drakengard, Legend of Zelda, Mass Effect, and Deus Ex.
Honorable mentions go to the Neverwinter Nights series, Elder Scrolls series, Dragon Age: Origins, Borderlands, Ogre Battle 64, and Psychonauts.

I think the game I've spent the most lifetime hours on is probably Secret of Mana for the SNES.