These are the top ten games I can not live without. Keep in mind, I have not played any game for PS3/360/Wii.
I don't own any one of those systems.

1. Ace Combat (The entire series) - PS2
2. Resident Evil 4 - PS2
3. F-Zero and F-Zero X - Super Nintendo - Nintendo 64
4. Super Smash Brothers - Nintendo 64
5. Mario Kart 64 - Nintendo 64
6. Need For Speed Underground 2 - XBOX
7. Black - XBOX
8. Grand Theft Auto: San Andreas - XBOX
9. Tony Hawk's Underground 2 - XBOX
10. Armored Core (The entire series) - Playstation 1 and 2

These are the top ten games that I just cannot live without. I am always playing these games and they are always in my cycle. There are some other guys that get into a cycle where I'll have a huge interest in it, play it for a couple days, and then not touch it again for several months.

Edited, Approved.