Spawn

Make Games with Words

Learn about spawn

Make Games with Words

Learn about spawn
Spawn Tactics
Spawn Tactics — back of box
@dreamcatcherStrategy

Spawn Tactics

Candy Clash
Candy Clash — back of box
@jissiAction

Candy Clash

Just Another Day
Just Another Day — back of box
@abbidabbiPuzzle

Just Another Day

Higher
@chuckyPlatformer

Higher

Blast Pit
Blast Pit — back of box
@abdulExtraction

Blast Pit

This Is Why We Can't Have Nice Things
This Is Why We Can't Have Nice Things — back of box
@seeleArena Brawler

This Is Why We Can't Have Nice Things

Salvage Swarm
Salvage Swarm — back of box
@ressSurvivors

Salvage Swarm

Ascent
Ascent — back of box
@calPlatformer

Ascent

Meatpile
Meatpile — back of box
@enfeulAction

Meatpile

Galaxy Enigma
@enigmagamesShooter

Galaxy Enigma

Worst Way Home #5
Worst Way Home #5 — back of box
@chuckyAction

Worst Way Home #5

Survive The Button
Survive The Button — back of box
@seeleSurvivors

Survive The Button

Drunk Typing
Drunk Typing — back of box
@jissiAction

Drunk Typing

The Button That Presses Back
The Button That Presses Back — back of box
@goblinjoPuzzle

The Button That Presses Back

Choose Wisely
Choose Wisely — back of box
@sunnyoceanf8d04Puzzle

Choose Wisely

Bonk Ball
@chuckyParty Game

Bonk Ball

Dust & Glory
@seeleTactics

Dust & Glory

Ring Rat
Ring Rat — back of box
@digifreakedRacer

Ring Rat

Hold the Light
Hold the Light — back of box
@vynxCozy

Hold the Light

ITERO
ITERO — back of box
@abbidabbiRoguelite

ITERO

The Long Night
@chuckyAction

The Long Night

Keep of the Un-Pressed
Keep of the Un-Pressed — back of box
@enfeulGacha

Keep of the Un-Pressed

Important Work
Important Work — back of box
@prospiegamesPuzzle

Important Work

Under No Circumstances Should Bodies Hit the Floor, But Falling Off Is Within the Realm of Possibility; In Which Case Bodies Will Indeed Hit the Floor
Under No Circumstances Should Bodies Hit the Floor, But Falling Off Is Within the Realm of Possibility; In Which Case Bodies Will Indeed Hit the Floor — back of box
@calPlatformer

Under No Circumstances Should Bodies Hit the Floor, But Falling Off Is Within the Realm of Possibility; In Which Case Bodies Will Indeed Hit the Floor

About Spawn

Spawn is a game where creation is the gameplay. You open it, you're in your world, and you build with an AI companion named Savi. There's no editor, no canvas, no separation between building and playing. You describe what you want in natural language and the world grows in front of you. Your friends are in the world with you while you build. Everyone can talk to Savi. Creation is free.

How It Works

You create a new game and you're standing in a flat grassy world you can run around in. Hold Tab + T to talk to Savi. Ask for a tree and one appears in front of you in under 30 seconds. Ask for mountains and they grow from the flat grass with rocky cliff faces right in front of you in under 60 seconds. Share a link with a friend — they join your live multiplayer world right away from any device. They ask for a house and a pond and both appear in under 60 seconds. You can ask for a wave tower defense game and it appears in under 2 minutes. Hold Tab + T, ask for anything.

Custom Engine

Spawn runs a custom engine built from scratch for the AI era. The game world is a declarative spec with six concepts (terrain, inputs, objects, player, camera, UI). Savi manipulates this spec via tool calls and the engine interprets changes into ECS world state in real-time — tool call to visible change in seconds, not minutes.

The ECS uses archetype-based storage with SoA (Structure of Arrays) backends. Components have replication policies — distance-filtered, ownership-filtered, broadcast, or local-only. The system scheduler supports dependency ordering and cadence-based execution. Behavior scripts run in a sandboxed environment with lifecycle hooks (onSpawn, update, onInput, onInteract, onCollide, onTriggerEnter, onTriggerExit, onControlBegin, onControlEnd, onLiquidEnter, onLiquidExit) and use require() for builtins and library modules.

Netcode

Binary wire protocol with dual-channel architecture: a reliable control channel and an unreliable snapshot channel. The engine runs at 60 Hz with a fixed-step ticker. Snapshot replication uses binary-encoded delta compression with 5 frames of redundancy per message — only changed fields are transmitted. Area-of-interest filtering means clients only receive state for nearby entities, with grace periods to prevent oscillation at boundaries. A server-driven dynamic throttle adjusts per-client tick rate based on input buffer health.

Physics

Deterministic WASM physics engine. Server-authoritative with client-side prediction. Character controllers, rigid bodies, colliders, sensor events, and overlap tracking. Raycast API with configurable distance, group masks, and entity filtering. One physics world per place — entity transfers between places dispose and recreate physics state. Client-side prediction uses an operation log buffer per component with mismatch detection and rollback resimulation up to 45 ticks. Interpolation for smooth remote entity rendering.

Asset Pipeline

Everything generates from natural language — 3D models (rigged characters with skeleton and animations, or static props), images, transparent PNGs, pixel art, music, sound effects, and custom voices. Every 3D model goes through automatic post-processing: scale normalization, mesh optimization (20-40% file size reduction), AVIF texture compression, 4-level LOD generation, and convex decomposition for physics colliders. LOD and collider generation run in parallel. Impostor rendering bakes distant models into flat billboards. Users can upload their own assets through the same pipeline.

AI in Games

Three built-in LLM job types for any behavior script: free-form chat with persistent conversation memory, structured JSON generation with schema validation, and memory reset. Savi can become a live dungeon master — behavior scripts send world events (boss defeated, secret found, player choices) and Savi reacts in real-time, modifying the world and spawning encounters. Background agents (wisps) run concurrently for parallel tasks.

Game Feel

52-method Juice API across 13 categories: object effects (highlight, shake, dissolve, trail), camera (screen shake, hitstop, zoom, letterbox), screen effects (flash, vignette, slow-mo), particles, UI (damage numbers, toasts, announcements), spatial audio with 5 buses and reverb zones, timing and schedules, mood and weather, data registries, encounter waves, narrative dialog and choice trees, progress tracking, and economy systems. Audience routing controls who sees each effect.

Places, Terrain, and Mods

Games can have multiple places — dungeons, realms, dimensions — each with their own terrain, physics world, atmosphere, and entities. Heightmap terrain with material blending, rivers, ponds, oceans, and a scatter system for automated object distribution (poisson disk, grid, clustered sampling). Mods are publishable and installable — creators have built a Cinemachine Toolkit, Slash FX Tool, Animation Browser, and Prefab Painter.

What People Build

Any genre: roguelikes, shooters, platformers, RPGs, racing games, puzzle games, horror games, cozy sims, soulslikes, MMOs, TCGs, survival games, idle clickers, bullet hells, fishing simulators. Complete worlds with terrain, buildings, characters, enemies, items, vehicles, music, game logic, atmosphere, AI-powered NPCs, and multi-scene environments. Every game on this page was made with words, not code.

The Team

Founded by Jacob Sansbury (second company; previous exit to Robinhood). Built by a team of under 10 and backed by an unannounced round. Spawn spent about 18 months in early alpha and moved into beta in February 2026. Still early and iterating fast.

What we're building, and every engine release: spawn.co/s

Full technical documentation: spawn.co/llms.txt