What are some games (new or old) that you have played time and time again that just never seem to lose their luster? I can think of a few that come to mind.
Castlevania Symphony of the Night(PS/PSN/XBLA) - I've played this tons of times on the PS and the PS3. Every time I play it I still find new things that I never knew of before.
Killing Floor (PC) - This game was "Left 4 Deading" long before Left 4 Dead, and the stand alone game made it that much better. The game is always getting updates to keep it fresh.
Naruto: Clash of Ninja series (GC/Wii) - I'm a big fan of Naruto and fighting games, and these games meet in the middle to form an excellent and fun series. Not too technical compared to other fighters, but they have enough variety to keep you coming back time and time again.
Ikaruga (GC/XBLX/PC) - I have mainly played the Gamecube version, and even though the game is pretty short, there is some much room for your own personal improvement. It's just a lot of fun to play.
Final Fight (Arcade/XBLX/PSN) - Still the best beat em up game ever made IMO. I can always fire this game up and have a good time.
Phantasy Star Portable (PSP) - A mission based game that keeps you coming back for more with lots of weapons and upgradeable skills. I love how the difficulty scales in this game. Stupid easy at first, then it gets really difficult later on.
So what are some games that you never get tired of?