Doom II: Hell on Earth

The player views the action from a first-person perspective and must survive demon-filled levels, find keys, operate switches, and reach each exit. Weapons and ammunition are collected during exploration, while health and armor provide limited protection. The campaign progresses through 30 regular levels, two secret levels, and a final encounter. Enemies differ in movement, attacks, and durability, so positioning and weapon choice matter. The DOS release also supports single-player, cooperative, and competitive multiplayer modes through its original networking and modem or serial options.

Doomguy

The unnamed space marine controlled by the player. He fights the demonic invasion of Earth and its colonies.

Explore every room carefully because secret areas often contain weapons, ammunition, armor, or power-ups. Conserve scarce ammunition for stronger enemies, and use the Super Shotgun at close range when its wide spread is effective. Keep moving, use doors and corners to separate enemies, and learn the locations of damaging floors and ambushes. Save before risky encounters, especially when entering unfamiliar rooms or approaching a boss fight. - Use the automap to identify unexplored corridors and missed branches. - Avoid wasting powerful weapons on weak enemies when safer alternatives are available. - In multiplayer, control narrow routes and deny access to important items.

IDDQD

Toggles invulnerability mode.

IDKFA

Grants all weapons, full ammunition, and all normal weapon-related keys.

IDFA

Grants all weapons and full ammunition, without the keys.

IDCLIP

Toggles no-clipping mode, allowing the player to pass through walls.

IDBEHOLD

Displays the power-up selection; append S for a berserk pack, I for partial invisibility, R for radiation shielding, V for invulnerability, and A for an all-map.

IDCLEV##

Warps to episode-level notation used by Doom II, with the two digits representing the target map, such as IDCLEV15 for Map 15.

IDDT

Toggles automap information modes; use while the automap is open.

IDCHOPPERS

Displays the classic chainsaw message and grants the chainsaw.

Save ammunition for enemies with high health or dangerous attacks.

Search walls and dead ends for secret doors, but watch for ambushes.

The Super Shotgun is powerful at close range but slow to reload.