Defense & Survival

Knock Knock: Room Defense Guides, Tips & Codes

A five-minute room-defense run from 4399. Close the door, lie down to generate resources, upgrade the door, bed and heroes, and hold out against ghosts across school, hospital, hotel and train maps.

Developer: 4399
Publisher: Joy Nice Games
Platforms: iOS, Android
Released: Nov 21, 2025
Status: Active (iOS US since September 2026)
Difficulty: Medium

Start with: Knock Knock: Room Defense Beginner's Guide: Door vs Bed

Original cover art for Knock Knock: Room Defense

// Guide hub

4 guides for Knock Knock

Beginner

Beginner Oct 23, 2026

Knock Knock: Room Defense Beginner's Guide: Door vs Bed

A five-minute run plan for Knock Knock: Room Defense: when to upgrade the door, bed, or hero, how to spend stamina, and the first Room Research picks.

5 min read

Codes

Codes Oct 23, 2026

Knock Knock: Room Defense Codes and How to Redeem

Knock Knock: Room Defense codes seen on October 23, 2026, the Settings redemption path, Android and iOS differences, and a safe testing routine.

4 min read

Tips

Tips Oct 25, 2026

Knock Knock Room Defense Economy Guide: Bed First, Door Second

How Knock Knock: Room Defense's bed-and-door economy compounds, why offline rate follows the bed, and how to place melee, ranged and support.

5 min read

Builds & Tier Lists

Builds & Tier Lists Oct 23, 2026

Knock Knock: Room Defense Hero Tier List

A role-based Knock Knock: Room Defense tier list with real hero names, build-if notes, promotion targets, and a five-slot team template that covers every job.

5 min read

About Knock Knock: Room Defense

A five-minute room-defense run from 4399. Close the door, lie down to generate resources, upgrade the door, bed and heroes, and hold out against ghosts across school, hospital, hotel and train maps.

Availability: Global English, Traditional Chinese, Korea. Current state: Active (iOS US since September 2026). We re-check store listings when a guide is updated; if a version disappears, the guide says so instead of pretending it is still live.

Editorial note: 4 guides on this page were verified against the store listing and at least one secondary source. Mechanics that only exist in another regional build are labelled.

Sources checked: [1] [2] [3] [4] [5] [6] [7]

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