About Crystal Caves
Crystal Caves is Apogee Software’s 1991 side-scrolling platform game for MS-DOS PCs, not a real cave you can visit. Apogee developed and published it for IBM PC compatibles, and it came out on October 23, 1991. Frank Maddin designed it, taking his inspiration from Miner 2049er, a 1982 game for Atari 8-bit computers. It is a single-player game.
Apogee divided Crystal Caves into three episodes. The first went out as shareware, free to copy and pass on, and the other two had to be bought. Maddin later said the method worked “pretty well” for the time. The shareware episode came with Apogee’s 1991 vendor terms, which say anyone can copy and share the program as long as they don’t charge for it. Apogee Entertainment holds the rights today.
What DOS.Zone offers is that first episode and nothing more. We checked the file list of the bundle the page loads on 1 November 2026: it holds Episode 1’s files and Apogee’s vendor document, and episodes 2 and 3 aren’t included.
How it runs in your browser
Play takes you to dos.zone in a new tab, where the Crystal Caves page boots the game in js-dos. That is DOS.Zone’s open-source DOSBox build for browsers, and it emulates an early-1990s PC right in the tab. The shareware files come from the site, so there’s no download, no setup and no account. DOS.Zone has no ads.
The listing is tagged action and platformer and holds 4.6 from 11 player reviews. Its description adds only that the game is free, needs no registration and has virtual controls for mobile. It doesn’t say whether progress is kept between visits, so check before you settle into a long run.
Controls and devices
Crystal Caves is played on the keyboard. DOS.Zone doesn’t list the keys, so look through the game’s menus when it starts, and click inside the emulator window first so the game picks up what you press.
DOS.Zone’s virtual on-screen controls let you try it on a phone. The game was built for a keyboard, though, and we haven’t tested it on a touchscreen, so a desktop or laptop suits it better. Chromebooks haven’t been confirmed.
Who it’s for
It suits people who remember Apogee’s shareware platformers and want a quick look at one without setting up DOSBox, and anyone who wants to try the free first episode before deciding whether the rest of the game is worth tracking down. Apogee also published Commander Keen: Marooned on Mars a year earlier, and on DOS.Zone that is likewise the first episode only. Bio Menace, a 1993 Apogee platformer, runs in the browser the same way.
Is Crystal Caves Free, Safe and Official?
Is Crystal Caves free to play?
Yes. DOS.Zone serves Episode 1, which Apogee released as shareware, and the 1991 terms that come with it let anyone copy and share it without charging for it. You play it in a browser tab with no account.
Is this the full game with all three episodes?
No. Crystal Caves has three episodes, and only the first was shareware; the other two were sold. We checked the file list of the bundle DOS.Zone loads, and it holds only Episode 1.
Can I play Crystal Caves on a phone?
DOS.Zone shows virtual on-screen controls on phones, but the game was made for a keyboard and we haven’t tested it on a touchscreen, so a computer is the better choice.
