Hummmm
I'm not sure I can pick just three "Games" having been playing since 1980 but I will say the following.
1) The Ultima series from Lord British (apple Ultima I & II, III-VIII PC)
2) Diablo series (I and Expansion, II and expansion & community mods - PC)
3) NeverWinter Nights (game plus 2 expansions, 3 for sale online modules and countless thousands of community modules - PC)
4) Civilization (I, II, III, and the best IV - PC)
5) Flight Simulator (pre Microsoft, and the last 4 Microsoft versions - PC)
6) Steel Panthers (I, II, III, free version (8.x) and now MBT- free version)
I could go on and on but to be still playing computer games 25 years later says something about me and the Industry. I do have a Nintendo GameBoy, both a PS2 and a PSP, and have had a Sega dreamcast, an Atari system, Commodore 64, Apple 64, Apple Mac and enjoy games on all these systems but I find that the console games are just pale version of what the PC has to provide. And what about the Bards Tales series, Kings Quest series, Papyraus racing games, GT3&4 etc......