Screeps Arena spawnCreep(): Find Your Spawn
Find your Screeps Arena Spawn with getObjectsByPrototype(), call spawnCreep(body), read object or error results, and avoid mixing Arena with MMO syntax.
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Practical Screeps articles for the problem you need to solve
Browse 81 published guides by system, difficulty, content type, or topic. Start with What Is Screeps? A Programming Strategy Game or follow the beginner sequence through How to Combine Your First Screeps Room Loop.
Screeps renewCreep(): Requirements, Cost, and Return Codes
Learn StructureSpawn.renewCreep() requirements, TTL and Energy formulas, Boost and CLAIM limits, return codes, and how to verify renewal on the next tick.
Why room.energyAvailable Stays Below Capacity in Screeps
Diagnose room.energyAvailable below energyCapacityAvailable by reconciling active Spawn and Extension Stores, holding one stable fill target, preserving transfer() results, and matching the processed Energy transfer on the next tick.
Screeps Spawn Exit Blocked: Diagnose Directions and Occupied Tiles
Confirm a blocked Screeps Spawn exit from current spawning state and all eight adjacent tiles, then fix direction policy without confusing accepted intents with observed birth.
Screeps spawnCreep() Errors: Diagnose Every Return Code
Capture the actual Spawn request, interpret each documented return code, separate dryRun from the final submission, and verify scheduled spawning across later ticks.
Screeps Multi-Spawn Queue: Priority, Deduplication, and Shared Energy
Centralize Creep demand, deduplicate stable request keys, rank emergency and replacement work, reserve shared room Energy locally, assign each idle Spawn once, and verify accepted names on later ticks.
Screeps recycleCreep(): Verify the Exact Creep Retirement
Bind one retirement request to exact Spawn and Creep IDs, reserve both objects, record pending evidence only after OK, then match the exact destruction event and Creep-tile Tombstone.
Screeps Emergency Harvester Recovery: Track the Exact Spawn Request
Detect whether a capable harvester exists or is already spawning, submit one minimum recovery request, save the exact Spawn and Creep name, and verify that request across later ticks.
Screeps Prespawn Replacement: Start the Next Creep Before the Current One Dies
Calculate a replacement deadline from ticksToLive, current Spawn work, body spawn time, travel and safety margin, prevent duplicate role replacements, preserve spawnCreep results, and observe the accepted name later.
Screeps Dynamic Creep Body: Minimum, Target, and Emergency Plans
Separate minimum, target, and emergency body policies; scale one role template within current Energy and the 50-part limit; then validate spawning separately.
Publication standard
English articles are published only after source review, official API checks where applicable, JavaScript syntax review where code is present, duplicate-intent and link checks, and editorial review. Publication does not imply Console or multi-tick live-room verification; those evidence states remain separate in each guide. Review the verification method.