Play abandonware games
Technically, abandonware games are games not supported anymore from their developers. If the original developer company is no more and if the game is so old that no one cares for it anymore, it becomes "abandoned". Usually, no one bothers about abandoned games but the retro gaming community, that's why it's so easy to find online games developed for now defuct platforms like Commodore 64, MS DOS, Sega Genesis, Windows 3.1, Spectrum, Amstrad CPC, etc. There were so many different home computers and consoles in the 80s and the 90s that abandonware became a niche phenomenon. If you're into abandonware for DOS and Windows, take a look at Abandonware DOS.
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PC*Bert
action / arcade
JROK
1997 
Anon's Nice Day
adventure / visual novel
-
2008NSFW 
Genocide
strategy
PyroSoft
1996 
Immoral Study Scenario 2: Ijima Yuka
adventure / visual novel
Himeya Soft
2000NSFW 
Little Princess
adventure / visual novel
Champion Soft
2008NSFW 
LoveChess: The Greek Era
strategy / board game
Interstudio
2004NSFW 
Super Real Mahjong PV
strategy / mahjong
SETA Corporation
1995NSFW 
Wilma Tetris
puzzle
Off Studio
2003NSFW 
A House in California
adventure / visual novel
Cardboard Computer
2010 
Mario and Luigi
platformer / arcade
Mike Wiering
2001 
Cover Girl Strip Poker
card game
Emotional Pictures
1991NSFW 
Adult Poker 1999
card game
Fervent Games
1999NSFW 
Immoral Study Scenario 1: Shirakawa Reiko
adventure / visual novel
Himeya Soft
2000NSFW 
S.D.I.
action
Cinemaware
1986 
The Three Stooges
action
Cinemaware
1987 
TV Sports: Boxing
action
Cinemaware
1991 
Strip Poker: a Sizzling Game of Chance
card game
Artworx Software
1985NSFW 
Helium Floating Object Engage Combat
platformer / arcade
TeknoPants
- 
Playhouse Strip Poker
card game
Eurosoft
1988NSFW 
TV Sports: Basketball
action
Cinemaware
1990 
Interactive Girls Club Games
puzzle
Interactive Girls Club
1993NSFW