Nightmare difficulty is the ultimate test in Door Kickers: Action Squad. Enemies hit harder, survive longer, and spawn in greater numbers. Ammo and health pickups are reduced. Bomb timers are tighter. And every room demands the same precision you would bring to a boss fight. This guide covers exactly what changes in Nightmare, which classes and loadouts can handle it, mission-by-mission strategies for the full gauntlet, and the survival rules that separate the operators who clear it from the ones who quit.
What Changes in Nightmare
Every modifier that transforms Normal into a genuine challenge
Enemy Stats
- Enemy health increased by approximately 50%
- Enemy damage output increased by ~40%
- Enemy movement speed slightly increased
- Armored enemies gain additional damage reduction
Mission Mechanics
- Bomb timers reduced by 25%
- Hostage rooms have more mixed civilian/enemy layouts
- Fewer ammo drops from defeated enemies
- Medkit pickups reduced by roughly one per mission
Spawn Behavior
- More enemies per room on average
- Reinforcement waves trigger faster
- Ambush rooms have increased enemy density
- Boss phases spawn additional adds more frequently
Nightmare Class Rankings
Not all operators are built for the hardest content
FBI
Extra items are everything in Nightmare. Two extra flashbangs and medkits turn impossible rooms into manageable fights. The tactical item bonuses make the FBI the undisputed Nightmare king.
Shield
The riot shield blocks devastating damage that would one-shot other classes. In co-op, the Shield becomes a mobile fortress. Solo play is slower but incredibly safe if you are patient.
Breacher
Shotgun room clears are still lethal, but his low health means one mistake ends the run. Only viable for players with perfect positioning and aggressive playstyles.
Assault
Balanced stats and no weaknesses make him the safest solo Nightmare pick. He will not set records, but he will not surprise-fail you either. The reliable workhorse.
Recon
Speed is less valuable when enemies kill you in two hits. The low health pool becomes a massive liability. Only viable for speed-run specialists who know every spawn.
Sniper
High single-shot damage is useful, but Nightmare enemies survive sniper shots more often. The slow fire rate becomes a liability when enemies rush in groups. Better in co-op.
Nightmare Loadout Rules
Four principles that determine whether your gear survives the gauntlet
Always bring two medkits minimum
One medkit is not enough for Nightmare. Enemies deal more damage, and health pickups are scarcer. Two medkits give you two recovery windows per mission.
Flashbangs over breaching charges
Breaching charges are situational. Flashbangs are universal crowd control. In Nightmare, where rooms have more enemies, flashbangs trivialize the hardest encounters.
Choose ammo efficiency over raw DPS
Ammo drops are reduced in Nightmare. A weapon that kills in 3 shots but has 30 rounds is better than one that kills in 1 shot but has 5 rounds. You will run dry otherwise.
Pair a precision primary with a panic secondary
Your primary weapon should be accurate and ammo-efficient. Your secondary should be something you can draw instantly when surrounded — usually a pistol or SMG.
Mission-by-Mission Walkthroughs
The full Nightmare gauntlet from first door to final boss
The Warm-Up Gauntlet
Nightmare 1-5Grunts and armored enemies only
Assault + M4A1 + M1911 + 2x Medkit + 1x Flashbang
Use these missions to learn Nightmare pacing. Enemies hit harder but the layouts are identical to Act I. Focus on not taking damage rather than speed.
Do not get cocky. These missions exist to lull you into a false sense of security before the real difficulty starts.
Shotgunner Introduction
Nightmare 6-12Armored enemies + shotgunners in every room
FBI + M4A1 + Desert Eagle + 2x Flashbang + 2x Medkit
Shotgunners become standard here. Flashbang every door before entering. Never assume a room is safe. Peek doors when possible instead of kicking immediately.
The FBI's extra flashbangs are the difference between clearing a room and dying on the threshold. Use them liberally.
Shield Wall
Nightmare 13-20Shield bearers + armored + shotgunners
Breacher + M1014 + AK-47 + 2x Breaching Charge + 1x Medkit
Shield bearers block frontal approaches and protect high-damage enemies behind them. Flank whenever possible. If no flank route exists, use breaching charges to destroy the shield instantly.
Breaching charges one-shot shields in Nightmare just like in Normal. The Breacher class makes charges even more effective. Save charges for shield rooms only.
Sniper Alley
Nightmare 21-30Snipers + mixed enemies + open sightlines
Sniper + AWM + M1911 + 1x Flashbang + 2x Medkit
Snipers punish exposed movement. Never walk in a straight line. Use cover-to-cover movement and peek-shoot. Eliminate snipers before engaging other enemies.
Counter-sniping is the safest approach. The AWM one-shots most enemies and penetrates light cover. Use your range advantage before they use theirs.
The Meat Grinder
Nightmare 31-40All enemy types at high density
Shield + Ballistic Shield + Glock 17 + 2x Medkit + 1x Flashbang (co-op: add Sniper partner)
Every room is a gauntlet. There is no easy encounter from this point forward. Co-op is strongly recommended. Solo players need optimized loadouts and memorized spawn patterns.
In co-op, run the Shield + Sniper combo. The Shield pushes forward while the Sniper eliminates threats. In solo, the Assault or FBI with double medkits is the only reliable option.
Boss Prologue
Nightmare 41-50All enemies + mini-boss encounters
FBI + SCAR-L + Desert Eagle + 2x Flashbang + 2x Medkit
Mini-bosses appear before the true boss fights. They have increased health and spawn adds. Clear adds first, then focus fire. Never ignore reinforcements.
The FBI's extra items shine here. Two flashbangs handle add waves, and two medkits recover from mini-boss damage. This is the loadout that makes Nightmare 41-50 survivable.
The Crime Lord (Boss)
Nightmare 51-60Crime Lord + endless adds + environmental hazards
Assault or FBI + highest-DPS assault rifle + 2x Medkit + 1x Flashbang
Phase 1: Clear adds as they spawn. Use the full room to kite the Crime Lord. Phase 2: He switches to grenade throws — watch for the animation and dodge immediately. Never stand still.
Solo players: kite constantly and clear adds before touching the boss. Co-op: one player kites the boss while the other clears adds. Communication is mandatory.
The Final Push
Nightmare 61-70Maximum enemy density, all types, reinforced doors
FBI + SCAR-L + Desert Eagle + 2x Flashbang + 1x Breaching Charge + 1x Medkit
These missions are designed to test everything you have learned. Every room has multiple threat types. Breaching charges are mandatory for reinforced doors. Flashbangs are mandatory for crowded rooms.
There is no room for error. One missed shotgunner, one ignored shield, one wasted flashbang — any mistake compounds. Play methodically. Speed is your enemy here.
The Fallen (Boss)
Nightmare 71-78The Fallen + shield bearers + shotgunners
Shield + Ballistic Shield + Glock 17 + 2x Breaching Charge + 2x Medkit (co-op essential)
Phase 1 is standard combat. At 50% health, The Fallen summons shield bearers and shotgunners. Save ALL your flashbangs and explosives for this phase. Clear the adds, then finish the boss.
This boss is borderline unfair in solo Nightmare. Co-op is practically required. The Shield absorbs the boss's attacks while the partner clears the adds and deals damage.
Final Stand (Boss)
Nightmare 79-84Three-phase boss + all enemy types + strict timer
Co-op mandatory: Shield + Sniper with max items. Solo: FBI with max medkits, flashbangs, and breaching charges.
The ultimate test. Phase 1: standard boss with adds. Phase 2: timer starts, shield bearers spawn. Phase 3: endless waves until the boss dies. Clear each wave completely before pushing.
Do not attempt solo on your first Nightmare playthrough. Final Stand is designed as a co-op finale. Bring your best partner, your best loadout, and your best communication.
Survival Rules
The habits that separate Nightmare survivors from casualties
The 3-Second Rule
Before kicking any door in Nightmare, pause for 3 seconds. Listen for audio cues, check for alternate angles, and mentally plan your cover position. Those 3 seconds save more lives than any weapon.
Never Reload in Combat
In Nightmare, enemies kill you during reload animations. Always switch to your secondary instead. It is faster, keeps you dealing damage, and might save your life when a shotgunner rounds the corner.
Heal Immediately After Fights
Do not carry low health into the next room. A half-health operator dies to a single shotgun blast. Heal as soon as the room is clear, even if it costs time. Living is better than fast.
Restart Early, Restart Often
If you take significant damage in the first two rooms, restart. Health does not regenerate, and early mistakes compound. A clean restart is faster than finishing a broken run.
Memorize Before You Speed-Run
Nightmare is not the mode for learning layouts. Play each mission on Normal first to learn spawns, then tackle Nightmare with that knowledge. Trying to learn AND survive simultaneously is masochism.
Co-Op Nightmare Strategies
Nightmare is designed for two players — here is how to dominate as a duo
Shield + Sniper: The Unkillable Duo
The Shield pushes forward and blocks all incoming damage. The Sniper eliminates threats from safety. This duo handles every Nightmare mission including bosses. It is slow but virtually unkillable with good communication.
FBI + Assault: The Tactical Toolbox
The FBI brings 6 tactical items instead of the usual 4. Combined with the Assault's steady damage, this pair has an answer for every room. Flashbangs for crowds, medkits for recovery, breaching charges for shields.
Double FBI: The Item Flood
Two FBI agents means 12 tactical items per mission. You can flashbang every single room and still have medkits left over. This is the most forgiving Nightmare strategy — it is almost impossible to run out of options.
Nightmare Quick Reference
Everything you need at a glance before starting the gauntlet
| Mission Block | Primary Threat | Best Class | Key Gear |
|---|---|---|---|
| NM 1-5 | Learning curve | Assault | M4A1 + Medkit x2 |
| NM 6-20 | Shotgunners | FBI | Flashbang x2 + Medkit x2 |
| NM 21-30 | Snipers | Sniper | AWM + Medkit x2 |
| NM 31-50 | Mixed gauntlets | Shield (co-op) | Shield + Glock + Medkit x2 |
| NM 51-60 | Crime Lord boss | Assault / FBI | High-DPS AR + Medkit x2 |
| NM 61-78 | The Fallen boss | Shield (co-op) | Breaching Charge x2 + Medkit x2 |
| NM 79-84 | Final Stand | Shield + Sniper | Max everything, co-op mandatory |
READY FOR THE GAUNTLET?
Nightmare is the ultimate test. Make sure your loadouts are locked, your partner is ready, and your nerves are steady.