An oftentimes overlooked era of games from the 1990s, PC MS-DOS side scrollers.
I surveyed retro gamers online, these were the top 10:
0:55 - Number 10 - Halloween Harry/Alien Carnage (1993) by Interactive Binary Illusions / Apogee Software
1:56 - Number 9 - "Lost Vikings (1993) by Silicon & Synapse, original name of Blizzard"
2:50 - Number 8 - Monster Bash (1993) by Apogee Software
4:09 - Number 7 - Cosmo's Cosmic Adventure (1992) by Apogee Software
5:01 - Number 6 - Captain Comic (1988) by Color Dreams
5:42 - Number 5 - BioMenace (1993) by Apogee Software
6:46 - Number 4 - Jill of the Jungle (1992) by Epic MegaGames
7:45 - Number 3 - Jazz Jackrabbit (1994) by Epic MegaGames
9:00 - Number 2 - Duke Nukem (I and II) (1991 & 93) by Apogee Software
10:06 - Number 1 - Commander Keen series (mostly 4 & 6) (1990) by id / Apogee Software