How to Clear Stages 3-4 in Knock Knock: Room Defense Haunted Room Mode

To clear Stages 3 and 4 in the Haunted Room mode of Knock Knock: Room Defense, buy the first two bed upgrades immediately after entering the room. Establishing early income generation is essential for surviving the ghost's rising damage scaling while building up your defensive turrets.

Early Bed Upgrades and Income Pacing

Ghosts scale their attack power quickly in Stages 3 and 4. Spending initial capital solely on door health creates an income deficit, leaving you without funds to buy turrets later in the round.

• Immediate setup: Spend your starting gold on the first two bed upgrades right when the room opens.
• Balanced growth: Upgrade your bed once, then observe door durability during the incoming ghost wave before committing to another income upgrade.
• Turret transition: Higher bed levels shorten the time required to save gold for offensive turrets, allowing defensive coverage before the ghost breaks your door.

Door Durability and Repair Timing

Passive door regeneration is insufficient against the higher damage outputs of Stage 3 and Stage 4. You must execute manual door repairs to withstand dedicated siege phases.

If your door health falls below 50%, pause construction upgrades and perform manual repairs immediately. Always retain a small gold buffer while the ghost attacks your entrance. Exhausting your gold supply on structural upgrades during an active attack leaves you unable to repair emergency damage, resulting in instant defeat. Delay building new structures until the ghost retreats or your existing turrets force it back.

Turret Placement and Upgrade Priorities

After establishing steady income from your bed upgrades, begin placing offensive turrets to defend the entrance.

• Distribute fire: Avoid grouping all turrets in one corner. Spread them across your layout so your target remains under continuous fire from multiple angles.
• Upgrade existing turrets: Level up your active turrets to higher tiers before purchasing additional units. In Stage 4 mid-game transitions, upgrading existing turrets yields a better damage-per-gold yield than adding base-level turrets.
• Maintain repair reserves: Only build a new turret when your total gold balance can cover the turret cost plus at least two manual door repairs.

Adapting to Ghost Attack Patterns

Ghosts in Stages 3 and 4 cycle between quick probe attacks and sustained damage phases. Use the brief lulls between attacks to reinforce structure health and upgrade your bed.

If you lose repeatedly in the first 60 seconds of a stage, focus your initial strategy on bed investment. Running out of gold during early attack waves indicates that early bed upgrades were delayed, preventing your economy from keeping pace with door repair costs.