DOOM Episode 1 Guide: Surviving Knee-Deep in the Dead

Want to play DOOM - the 1993 id Software original - without installing DOSBox or digging through abandonware sites? On SchoolBros it boots directly in your browser. One thing we'll say plainly up front: this is the shareware version, meaning the complete first episode, Knee-Deep in the Dead - all nine maps, including the secret level. That's not a limitation we invented; it's the exact episode id Software told the world to copy and share freely in 1993, and it remains the most-played slice of DOOM in history. No download, no account. Grab the shotgun and go.

How Does DOOM Run in a Browser?

DOOM was an MS-DOS game, so the browser version runs on js-dos - the DOSBox emulator compiled to WebAssembly. Your browser spins up a faithful little DOS machine, and the genuine 1993 executable runs inside it, sound effects, MIDI soundtrack and all. Everything executes locally on your device: there's no video streaming, no remote server playing the game for you, and therefore no input lag beyond what your keyboard adds. Click play on the game page and you're at the E1M1 start switch in seconds.

• Platform: js-dos (DOSBox compiled to WebAssembly), running the DOOM shareware episode
• Controls: Arrow keys move/turn, Ctrl fire, Space use, Shift run, Alt+arrows strafe
• Original release year: 1993 (id Software)
• Download required: None

Tips for Surviving Knee-Deep in the Dead

• Learn to circle-strafe. Hold Alt (or your strafe key) and sidestep in a circle around enemies while firing. Almost every projectile in DOOM can be dodged on foot, and circle-strafing turns imp fireballs into a non-issue. It's the single most important skill in the game.
• Hunt the secret walls. Episode 1 is packed with hidden rooms - look for walls with slightly misaligned or discolored textures and press Space against them. Secrets hide armor, rocket launchers, and the route to E1M9, the secret level reachable from E1M3.
• Respect the berserk pack. The black medkit with the red cross doesn't just heal you to 100% - it supercharges your fists for the rest of the level. Punching pinkies apart saves precious shotgun shells.
• Let the monsters fight each other. If a stray fireball from one demon hits another, they'll turn on each other. Position yourself so enemies catch friendly fire and watch the room clear itself.
• The shotgun is your workhorse. Ammo for it is everywhere in Episode 1, it staggers most enemies, and it one-shots former humans. Save bullets for picking off distant targets.

Classic DOOM Cheat Codes

Because this is the real DOS game under emulation, the original cheat codes work exactly as they did in 1993 - just type them during gameplay:

Code	Effect
IDDQD	God mode (invulnerability)
IDKFA	All weapons, full ammo, and all keys
IDFA	All weapons and full ammo (no keys)
IDSPISPOPD	No-clip - walk through walls
IDCLEV##	Warp to episode/map (e.g. IDCLEV13 for E1M3)
IDBEHOLD	Power-up menu (then press S, V, I, R, A, or L)
IDDT	On the automap: reveal full map, then objects
IDCHOPPERS	Chainsaw

Features of the Browser Version

Because js-dos gives DOOM a persistent virtual file system backed by your browser's storage, your in-game saves can survive between sessions - save from the menu like it's 1993, come back later in the same browser, and load your game. The emulator runs the shareware episode at its original pace on essentially any modern hardware, Chromebooks included, and keyboard controls work immediately with no setup. It's the authentic DOS experience, minus the DOS.

Frequently Asked Questions

Is this the full version of DOOM?

No - and we're upfront about that. This is the shareware release: the complete first episode, Knee-Deep in the Dead, with all nine maps including the secret level. id Software distributed this episode freely by design, so it's the legendary, legally shareable slice of the game rather than the full three-episode retail release.

Do I need to download anything?

No. DOOM runs through js-dos, a version of DOSBox compiled to WebAssembly that executes entirely in your browser. No installer, no plugin, no account.

Do the classic cheat codes work?

Yes. This is the genuine DOS game under emulation, so IDDQD, IDKFA, IDSPISPOPD and the rest all work - just type them during play.

Does it work on a Chromebook?

Yes. Any modern browser with WebAssembly support runs it, and a 1993 DOS game is trivially light for today's hardware.

What are the controls?

Classic DOS defaults: arrow keys to move and turn, Ctrl to fire, Space to open doors and hit switches, Shift to run, Alt plus arrows to strafe, and number keys to switch weapons.

The Legacy of DOOM

Released in December 1993, DOOM didn't invent the first-person shooter, but it defined it. John Carmack's engine made fast, textured 3D-style worlds possible on ordinary PCs, while John Romero's level design for Episode 1 remains a masterclass in flow and secret-hunting. Just as revolutionary was how it was sold: id gave the entire first episode away as shareware and encouraged everyone to copy it, a distribution gamble that put DOOM on millions of machines and made "have you played DOOM?" a universal question in mid-90s computing. The community that grew around its WAD files essentially founded modern game modding - people are still building new DOOM levels today, more than thirty years later - and porting DOOM to improbable devices has become a running tradition of its own.

If run-and-gun action is your speed, our write-ups on Metal Slug X and Resident Evil 2 cover two more classics you can play in your browser. For a change of pace, try Tekken 3, GTA: Vice City, or the original Super Mario Bros. - or browse the full games library.

More to Play

Finished a run through Knee-Deep in the Dead? Browse our picks of games to play when bored at school, see which GTA games are playable unblocked in a browser, or check out our Unblocked Games 66 and 76 alternatives.