Pong.
Then Breakout.
Then Pacman and Space Invaders.
Then the 8-bit classics on the Sinclair and Commodore: Galaga, Elite, Jet Set Willy, Donkey Kong, Commando, etc... many many more.
Then the Amiga: Shadow of the Beast, Defender of the Crown, F-18 Interceptor, It Came From the Desert, Grand Prix.
Then came the PC and Prince of Persia! Lots of hours playing Prince of Persia. And MS Flight Simulator.
Then came Windows 95 and around that time I was playing Doom, Duke Nukem, Magic Carpet, original Warcraft. I tried Quake but it didn't appeal to me. Too brown.
Then in late 90s came the first modern 1st person shooters: Quake 2, Half-Life and Unreal. I played the hell out of them.
Oh if some of you have not played the first Unreal, go find a copy and play it. The graphics are passable even today. That game was way ahead of its time and the gameplay was lots of fun. There's a way to hack Unreal and the first Unreal Tournament to play the original Unreal single player game in the Tournament engine with the updated graphics! That ROCKS!