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Commander Keen: Invasion of the Vorticons (1990)
5.6/10on IGDB
Released
The free Marooned on Mars sends Keen looking for the missing pieces of his spaceship. The Earth Explodes trades that scavenger hunt for a trip through a Vorticon mothership to stop its weapons from firing on Earth. Keen Must Die! takes the fight to the Vorticon homeworld and gives the adventure its payoff.
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Crystal Caves (1991)
7.6/10on IGDB
Released
The first set of crystal mines bankrolls Mylo’s twibble farm. Slugging It Out sends him back underground to fund a different scheme, and the third episode gives him another set of mines with its own look. It’s a good registration if the pleasure is working out each room’s route and then trying to make it cleanly.
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Wolfenstein 3D (1994)
Released
The free castle escape teaches you to check corners and listen for a door. Operation: Eisenfaust takes those habits into a lab full of mutants, and the full DOS release gives you six episodes to work through. The extra campaigns also include a prequel arc, so there’s more to the paid set than the rest of the escape.
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Jill of the Jungle (1992)
4.7/10on IGDB
Released
The free jungle episode introduces Jill’s spinning blade and her animal transformations. Jill Goes Underground moves the platforming below the surface, and Jill Saves the Prince gives the rescue its own chapter. The Complete Trilogy groups all three, so the first game’s title on its own is worth checking when you look it up.
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Cosmo's Cosmic Adventure (1992)
8.1/10on IGDB
Released
Cosmo’s suction-cup hands let him stick to walls, where a jump can open up a route you’d miss from the ground. The original download gave away the first of three Forbidden Planet adventures. The paid chapters let you take that trick through more rooms and finish the search for his parents.
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Bio Menace (1993)
7.9/10on IGDB
Released
Dr. Mangle’s Lab was the free opening, where Snake Logan starts clearing mutants out of Metro City. The Hidden Lab extends the rescue mission into a second facility, and Master Cain makes the third chapter a confrontation with the figure behind it. The full original later became freeware.
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Doom (2016)
8.5/10on IGDB
Released
Knee-Deep in the Dead gets you used to the corridors of a moon base. The Shores of Hell twists that familiar setting and ends with the Cyberdemon in the Tower of Babel. Inferno takes you farther into Hell, while the later Ultimate Doom adds a fourth episode beyond the original registered trilogy.
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Raptor: Call of the Shadows (1994)
7.8/10on IGDB
Released
Bravo Sector gives you a taste of banking mission earnings and buying upgrades between waves. Tango Sector and the Outer Regions make that spending matter over a longer campaign, where a purchase you passed up earlier can change what you’re able to take on later. The 1994 Classic Edition is the DOS release.
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Jazz Jackrabbit (1994)
7.6/10on IGDB
Released
Turtle Terror! is the free first episode, with three worlds from green Diamondus to the darker Medivo. Ballistic Bunny sends Jazz to three more, including Technoir, and the original paid run carries the chase all the way to the Twin Mega Battleships. The CD-ROM version is included in the Jazz Jackrabbit Collection.
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One Must Fall: 2097 (1994)
8.9/10on IGDB
Released
The shareware gave you three robots, one arena, and one tournament. Registering opened up more chassis and arenas, plus three more tournaments to put your upgrades to use. If you liked spending winnings on your machine between bouts, the full version gave you somewhere to take it.
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Heretic (1994)
7.9/10on IGDB
Released
City of the Damned introduces a fantasy shooter with items you can hold in reserve. Hell’s Maw and The Dome of D’Sparil continue that original campaign into rougher territory and a showdown with D’Sparil. Shadow of the Serpent Riders later expanded the game with two further episodes.
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Descent (2024)
Released
The seven free mines teach you to think about the ceiling and floor as routes. The full DOS game sends you through much more of the solar system and gives you weapons and missiles that the shareware left out. The longer run makes learning to turn, climb, and back out of a tight tunnel pay off.
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Duke Nukem 3D (1997)
Released
After the free L.A. Meltdown, Lunar Apocalypse sends Duke into orbit and Shrapnel City takes him back through places like a movie set and a stadium. That change of scenery is the reason to keep playing. The Birth came later with the Atomic Edition, beyond the original paid pair.
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Quake (2021)
8.2/10on IGDB
Released
Dimension of the Doomed is the only destination in the unregistered game. The paid episodes make the same movement work in stranger spaces, from The Dismal Oubliette in episode two to the Wind Tunnels in episode three. The Elder World is the fourth episode. Collecting all four runes opens a separate final level.
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