Heyo all.
Regarding retro gaming again, some of my favorite ones were for ms dos. These include shareware only games too! So, some of them were Mechwarrior 2, I spent more time customizing mechs than actually playing the game, and would often listen to soundtrack on a cd player too!

Other ms dos games of note, include wolfenstein 3d, I made levels and edited sprites in that game as a kid.

Doom of course too, fooled around with modding for it briefly and now I just play levels i find on doomworld and zdoom sites.

Stunts, a fun racing game where you could make your own courses. So much fun!

Quake, also endless levels and modding.

Monuments of mars, fun little 2d platformer.

Descent 1 and 2, great 6 degrees of freedom shooter. Played it online against friends a lot.

Duke nukem 3d. Infamous, but the level editing for it was so easy to do and game itself was pretty fun, especially playing with and against friends online!

Commander keen. Fun little platformer as well.

Skyroads. Great f zero style game!

Corncob 3d. Fun flight sim, you could even get out of the plane and walk wherever on foot.

MegatronVGA. Mech game where you fought mechs in a maze.

Sango fighter, fun street fighter clone.

One must fall 2097, great street fighter clone with awesome music.

Epic pinball, fun pinball game!

Lemmings, great puzzle game.

Stellar 7 and nova 9, battlezone style games that actually had a plot and powerups you could activate and hidden warps and other fun things.

I played all these games and more on a Radio Shack Tandy 1000. Great machine!