Doom (1993)

Doom (1993) revolutionized computer graphics by introducing multi-floor sector geometry, variable light levels, and rapid demon slaughter. Compiled directly to WebAssembly, this edition runs the complete Episode 1: Knee-Deep in the Dead (E1M1 to E1M9) with hardware-accelerated canvas rendering.

Movement Physics: Strafe-Running (SR40 / SR50)

In the original Doom engine, moving forward and strafing simultaneously calculates velocities on two orthogonal axes without normalization:

• •Standard Run Speed: 16.67 map units per second.
• •Strafe-40 (SR40): Holding W (Forward) and A or D (Strafe) moves Doomguy diagonally at 128% of normal run speed (~21.3 map units/sec).
• •Strafe-50 (SR50): Combining keyboard strafe, turn-strafe, and mouse movement pushes velocity to 141%, allowing players to cross impossible gaps.

Hitscanner Threat Priority

Enemies in Doom fall into two tactical categories:

• •Hitscanner Enemies (Zombieman, Shotgun Guy, Chaingunner): Fire instant line-of-sight bullet traces that cannot be dodged once fired. Prioritize eliminating hitscanners first using the Shotgun or Chaingun to stagger them.
• •Projectile Enemies (Imp, Cacodemon, Baron of Hell): Launch visible fireballs with travel time. Keep moving perpendicular to their firing arc to evade incoming damage while engaging high-priority targets.

Secret Door Visual Cues & Automap Navigation

Every level contains hidden passages yielding Supercharges, MegaArmors, and secret weapon caches:

• •Texture Misalignment: Look for wall panels whose vertical or horizontal alignment differs slightly from adjacent masonry.
• •Light Level Differentials: Shadows cast under walls with no obvious light source often indicate an interactable door (press Spacebar / E to open).
• •Automap Color Coding: Press Tab to open the map. Grey/yellow lines show unexplored doorways, while solid red lines delineate standard walls.

Classic Cheat Codes Reference

Type these cheat codes during gameplay without pausing:

• •IDDQD: Degreelessness Mode (100% God Mode Invulnerability)
• •IDKFA: Keys, Full Ammo, and All Weapons (Shotgun, Chaingun, Rocket Launcher, Plasma Rifle, BFG 9000)
• •IDFA: Full Ammo and All Weapons without keycards
• •IDCLIP / IDSPISPOPD: No-Clip Mode (walk through walls)
• •IDBEHOLDS: Radiation Suit Berserk Powerup