START LEARNING
Control your first Creep
Harvest Energy, deliver it to a Spawn, and understand the body parts that make the loop possible.
Open the beginner roadmap →SCREEPS · JAVASCRIPT · VERIFIED BOUNDARIES
Verified Screeps guides for safer automation and debugging
Learn with observable examples, return-code diagnostics, practical tools, and a clear record of what has been checked in documentation, offline tests, the Console, or a live room.
64 published English guides · 8 knowledge modules · 2 working tools
Every guide states its own verification level. Publication does not imply hidden live-room testing.
CHOOSE YOUR NEXT STEP
What do you want to do?
FIX A PROBLEM
Search an API, error code, or symptom
Search published guides, terms, return codes, tools, and common debugging questions.
USE A TOOL
Calculate or diagnose before changing code
Use a Creep body calculator and a read-only room snapshot diagnostic tool.
Browse English tools →01INPUTSource
→Energy enters the room economy.
02WORKERCreep
→WORK, CARRY, and MOVE define possible actions.
03OUTPUTSpawn · Controller
Delivery and upgrading create visible progress.
main.jsdebugging workflow
const result = creep.harvest(source);if (result === ERR_NOT_IN_RANGE) creep.moveTo(source);✓ inspect state ✓ read return code ✓ verify next tick
ENGLISH FOUNDATION
Beginner lessons, references, and API safety guides
The English section combines navigation, reference pages, search, verification rules, functional tools, and focused guides. Each guide is organized for a clear English search intent rather than translated sentence by sentence.
64published guides
2working tools
8knowledge modules
- 01First Creep sequence
Harvest Energy, deliver it to a Spawn, and understand WORK, CARRY, and MOVE.
- 02Reference pages
English error-code and glossary pages for quick lookup while reading code or the official API.
- 03Practical tools
Interactive body calculations and room snapshot diagnostics with explicit boundaries.
- 04Transparent publication checks
Each guide identifies the source, API, syntax, offline, Console, and live-room evidence that actually exists.
KNOWLEDGE MAP
A structured Screeps knowledge base
Browse the subjects the English section covers without mixing beginner lessons and advanced engineering into one list.
8 subject modules64 published guides
Open the knowledge map →- 01Memory and Code Structure
- 02Spawn and Creep Lifecycle
- 03Room Economy
- 04Movement and Vision
- 05Controllers and Expansion
- 06Construction and Defense
- 07Market and Advanced Resources
- 08Operations and Debugging
QUICK LOOKUP
English guides, references, and tools
ARTICLESRead practical Screeps guides
Search focused JavaScript and debugging guides by system, difficulty, content type, or topic.
ERROR CODESLook up Screeps return codesUnderstand common failures such as ERR_NOT_IN_RANGE, ERR_NO_PATH, ERR_BUSY, and ERR_FULL.
GLOSSARYReview core Screeps termsQuick definitions for Creep, Spawn, Memory, tick, RCL, CPU bucket, and other common concepts.
BODY TOOLBuild and calculate a Creep bodyCalculate Energy cost, spawn time, hits, carry capacity, and loaded movement speed.
ROOM CHECKDiagnose a room snapshotCheck Spawn, economy, Controller, construction, CPU, and bucket risks without connecting an account.
TOPICSBrowse by Screeps systemOpen focused topic archives for Memory, movement, Controllers, defense, market systems, CPU, and more.