There are alot, but I'm going to have to say Ocarina of Time, because even though I have beaten it twice with every possible thing you can get, and more times without....it's still fun to me.
Oddly enough, I'm going to have to say MechAssault 2: Lone Wolf. I put a year of my life into that game, pretty much.
Totally agree, Freelancer is the best game ever made. It still doesn't look outdated in any way. It never gets bored. With all the mods the gameplay is endless. This is the first (and only) game on pc that got me hooked like a good book. Sonic the hedgehog also belongs to my favourites. I played it tons of times back in the sega-era. It has action, speed and action and eh speed... oh and a good storyline Best multiplayer online game would be City of Heroes/villains. I played it 2 times, once on the beta-test and i used a 14-day trial a few weeks ago. Playing a superhero never bores.
It's only for PC. the game is pretty old so if you wanna but it it probably only costs about 10$ Official Site Freelancer Wiki
im suprised at all these answers...so many ppl name games that have been out recently (last couple of years) and not classics...i wouldve expected the other way around