REFERENCE
Check common error codes
Use the English return-code reference while testing actions and movement.
Open error codes →BEGINNER ROADMAP
Learn Screeps in twelve focused lessons
Follow the sequence from the first room and tick loop to one combined room script. Each lesson answers one beginner question, uses checked APIs, and states which Console or live-room verification remains pending.
01
STAGE 01
Understand Screeps
Learn what the game is, find the room view, editor and Console, then understand ticks and module.exports.loop.
- LESSON 01What Is Screeps? A Programming Strategy Game
Learn what Screeps is, how JavaScript controls its persistent world, and how Rooms, Creeps, Sources, Spawns, and Controllers work together for new players.
8 min read - LESSON 02Screeps First Room: Find the Editor and Console
Find your first Screeps Room, code editor, and Console, then use read-only commands to identify visible Rooms, Spawns, Creeps, Sources, and the Controller.
8 min read - LESSON 03Screeps Ticks and Game Loop: Why Your Code Runs Repeatedly
Understand a Screeps tick, Game.time, and module.exports.loop, then run safe observations that show why actions and state changes appear across later ticks.
8 min read
02
STAGE 02
Control the first Creep
Harvest Energy, deliver it to a Spawn, and connect WORK, CARRY, and MOVE to the abilities used by the loop.
- LESSON 04Screeps Harvest Energy: Your First Creep Script
Make one named Screeps Creep find a Source, move into range, and harvest Energy with a small script you can verify across later ticks.
9 min read - LESSON 05Screeps Energy Delivery: Creep to Spawn
Make one Creep transfer Energy to a named Spawn, preserve delivery mode across ticks, and complete its first Source-to-Spawn round trip.
10 min read - LESSON 06Screeps Creep Body Parts: WORK, CARRY, and MOVE
Inspect one Creep's active WORK, CARRY, and MOVE parts, then use its action result, Store, fatigue, and damage to diagnose missing abilities.
8 min read
03
STAGE 03
Create and assign simple roles
Spawn a new Creep, separate Harvester, Upgrader and Builder responsibilities, then automate Controller upgrading.
- LESSON 07Screeps spawnCreep(): Create Your First Creep
Use dryRun to validate a WORK-CARRY-MOVE body, submit one safe spawnCreep() request, read its return code, and verify the new Creep across later ticks.
8 min read - LESSON 08Screeps Creep Roles: Harvester, Upgrader, and Builder
Learn why Harvester, Upgrader, and Builder are player-defined responsibilities, how roles differ from body parts, and why a Creep name does not create behavior.
8 min read - LESSON 09Screeps upgradeController(): Build Your First Upgrader Loop
Build one Upgrader1 loop that harvests from an active Source, moves within Controller range 3, spends Energy with upgradeController(), and switches state across ticks.
10 min read
04
STAGE 04
Complete the first room loop
Build an Extension, give the Builder a small task priority, and combine all three roles inside one readable main loop.
- LESSON 10How to Build Your First Screeps Extension
Confirm RCL 2, place one Extension Construction Site, make Builder1 harvest and build it, and understand progress, capacity, and common failure states.
12 min read - LESSON 11How to Make a Screeps Creep Build and Repair Automatically
Give Builder1 a clear priority: build owned sites, repair selected damaged structures, and upgrade the Controller when no higher task exists.
14 min read - LESSON 12How to Combine Your First Screeps Room Loop
Combine fixed-name Harvester1, Upgrader1, and Builder1 logic with spawning, safe target checks, state switches, return-code logging, and explicit beginner limits.
20 min read
Complete beginner sequence published
All twelve English beginner lessons are connected with previous and next navigation, Chinese counterparts, search records, canonical URLs, reciprocal language links, FAQ schema, and Sitemap entries.
TOOL
Build a valid Creep body
Calculate Energy cost, capacity, spawn time, and loaded movement.
Open the body calculator →