There are 2 that i can fondly remember
Shattered Galaxy MMO (Several hours a day, 7 days a week for a couple of months) got so hooked that when i did decide to give it up i vowed no more Online games like this (like WoW etc) EVER!
Civilization i don' t remember which version, needless to say several months of continuous play, even skip university classes (and eventually screwing that up) after finishing that i vowed never to play any Civilization game ever again.
these games RULED my life so i decide to go cold turkey on them.
Other honorable mentions in no particular order -
Mechwarrior Series (every version and some played twice, love that salvage!)
Mechcommander Series (played version 1 at least 5 times, especially trying to salvage those Thor A & Masakari A mechs!)
Sacred (great time waster)
Age of empires 2
Battlefield series (1942, Vietnam, 2, Special Forces in LAN only)
Medieval Total War (conquered all of Europe twice - those uprisings really annoyed the heck out of me)
Counterstrike CZ (LAN)
Close combat series (played through each at least twice)
Dawn of War (& winter assault LAN)
Super Smash Bros & SSBM (unknown hours of chaos!!! Go NESS!!!)
Zelda TOoT & WW (Ranks as one of the best games i have played)
Golden Eye (played ever possible multiplayer combination we could think of!)
Mario64 (played through it twice)
< Message edited by Terrak -- 20 Jun 06 6:34:50 >