Inspired by @bjnovak. In no particular order. Based on remembered hours played.
  1. Munchman - TI994A
  2. Tunnels of Doom - TI994A
  3. Portal/Portal 2 - Mac
  4. Bard's Tale - Apple ][
  5. M.U.L.E. - Commodore 64
  6. Night Stalker - Intellivision
  7. Hollywood Hijinx - Apple PowerBook
  8. Tiny Wings - iPhone
  9. Sunset Riders - video arcade game
  10. Mombasa - Mac Plus
  11. Super Mario Brothers II - NES
  12. Mystery Funhouse - TI994A
  13. Legend of Zelda II: The Adventure of Link - NES
  14. RISK - Mac Plus
  15. Breakout - Blackberry
  16. This little analog football handheld game - Mattel Electronics
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  17. Myst / Riven - Mac OS 9/Performa XXXX
  18. Civilization - PC
  19. Below the Root - Commodore 64