DOS games from 1991 you can play online, free in your browser. 54 of the 577 titles here start instantly, with nothing to install.
They date from 1991 and lean towards action, puzzle and strategy / tactics.
'Nam 1965-19751991 · Strategy / tactics
Battle Isle1991 · Strategy / tactics
Castle of Dr. Brain1991 · Adventure
Commander Keen 4: Secret of the Oracle1991 · Action
Commander Keen 5: The Armageddon Machine1991 · Action
Commander Keen 6: Aliens Ate My Baby Sitter!1991 · Action
Commander Keen: Keen Dreams1991 · Action
Crystal Caves1991 · Action
Dangerous Dave in the Haunted Mansion1991 · Action
Dragon's Lair: Escape From Singe's Castle1991 · Adventure
Duke Nukum: Episode 2 - Mission: Moonbase1991 · Action
Eye of the Beholder II: The Legend of Darkmoon1991 · Role-playing (RPG)
Fantasy World Dizzy1991 · Action
Gateway to the Savage Frontier1991 · Role-playing (RPG)
Gobliiins1991 · Puzzle
Gods1991 · Action
Hugo II: Whodunit?1991 · Adventure
Leisure Suit Larry 5: Passionate Patti Does a Little Undercover Work1991 · Adventure
Leisure Suit Larry: In the Land of the Lounge Lizards (SCI Remake)1991 · Adventure
Lemmings1991 · Puzzle
Mixed-Up Mother Goose Enhanced1991 · Adventure
Monkey Island 2: LeChuck's Revenge1991 · Adventure
Oh No! More Lemmings1991 · Puzzle
Once Upon A Time: Little Red Riding Hood1991 · Action
Pick 'n Pile1991 · Puzzle
Pilgrim Quest1991 · Educational
Police Quest 3: The Kindred1991 · Adventure
Populous II: Trials of the Olympian Gods1991 · Strategy / tactics
Pref Club1991 · Strategy / tactics
Prehistorik1991 · Action
Reader Rabbit1991 · Educational
Roberta Williams' Mixed-Up Mother Goose1991 · Adventure
Scorched Earth1991 · Strategy / tactics
Sid Meier's Civilization1991 · Strategy / tactics5.0
SimAnt1991 · Simulation
Space Quest I: Roger Wilco in the Sarien Encounter (SCI Remake)1991 · Adventure
Space Quest IV: Roger Wilco and the Time Rippers1991 · Adventure
Street Rod 2: The Next Generation1991 · Racing / Driving
Strip Poker III1991 · Gambling
Supaplex1991 · Puzzle
Super Jeopardy!1991 · Educational
Terminator 2: Judgment Day1991 · Action
Test Drive II: The Collection1991 · Compilation
The Adventures of Maddog Williams in the Dungeons of Duridian1991 · Adventure
The Blues Brothers1991 · Action
The Final Battle1991 · Adventure
The Maniac1991 · Strategy / tactics
The Simpsons Arcade Game1991 · Action
Tunneler1991 · Action
Ultima Worlds of Adventure 2: Martian Dreams1991 · Role-playing (RPG)
Uncharted Waters1991 · Simulation
Volfied1991 · Puzzle
Western Front: The Liberation of Europe 1944-19451991 · Strategy / tactics
Xmas Lemmings 19911991 · Puzzle