During the 80's and 90's video games could be classified into certain genres, some of which are almost extinct. Here are Abandonware DOS statistics based on game genre.
action
action - first-person shooter
28
action - other action games
19
action - third-person shooter
6
adventure
adventure - action adventure
17
adventure - graphic, text input
18
adventure - interactive fiction
62
adventure - other adventures
14
adventure - point & click
84
adventure - visual novel
5
application
application - emulation
2
application - interpreters
2
application - other apps
5
arcade
arcade - Breakout / Arkanoid
5
arcade - Space Invaders
6
arcade - other arcades
37
puzzle
puzzle - falling blocks
10
puzzle - multiple character control
9
puzzle - multiple puzzle types
6
puzzle - other puzzle games
7
puzzle - tile-matching
15
puzzle - word game / trivia
6
racing
racing - motorcycle racing
4
racing - vehicular combat
7
rpg
rpg - first person perspective
42
rpg - isometric perspective
6
rpg - top-down perspective
45
simulation
simulation - city building
6
simulation - life simulation
9
simulation - other sims
8
simulation - political simulation
6
sports
sports - american football
3
sports - olympic sports
5
sports - unconventional sports
8
strategy
strategy - other strategy games
13
strategy - real time strategy
12
strategy - turn-based strategy
30
strategy - turn-based tactics
9
vehicle simulation
vehicle simulation - civilian flight
4
vehicle simulation - combat flight
24
vehicle simulation - naval, submarine
7
vehicle simulation - space sim
14
vehicle simulation - tank, mech
7