Build a machine from parts, then Simulate to test it. The fun is the arms race: design → test → watch it fail → improve.

① Build Mode

• Left-click empty cell — place the selected palette part · drag to place many
• Left-click a placed part — select it (opens the Inspector: bind keys, tune params)
• Ctrl/Shift+click — multi-select · drag empty space — box-select
• Selected parts glow orange. A top toolbar gives ↔ Move and ✕ Delete.
• Move mode (M or the Move button): drag the selection, or use the X/Y arrows (click an arrow = nudge 1 cell). No placing while moving.
• Delete — remove selection · Esc — deselect · R — rotate the ghost
• Mouse-wheel zoom · Right/Middle-drag or WASD — pan. ⊕ marks the center of mass.

② Simulation Mode

• W thrust (un-bound thrusters) · A/D steer with a gyro
• F — fire launchers · Your bound keys — activate those parts
• Space pause · R reset · I — spawn an incoming hostile missile
• Left-click set a target point · Right-drag pan · Wheel zoom

③ Physics Islands

• Disconnected groups of parts simulate as separate machines — a thruster only moves the island it's attached to.
• When damage cuts a machine in two, it splits into independent chunks that drift and fight on their own.

④ Build your own munitions

• Missiles & drones are built from parts, not a single block. A good missile = Rocket Motor (rear) + Seeker + Gyro + Guidance Computer + a Warhead at the nose, with Stabilizer Fins for a clean flight.
• Design it on the grid, then Munitions → Save build as munition to add it to your library (try loading the built-in Striker/Cruise to tweak).
• A Launch Rail ejects your saved munition — pick which one in its Inspector. Fires a fresh copy each press (infinite). Aim the rail where the munition should start.
• No seeker/guidance? It flies straight (a dumb rocket). Add a seeker + computer + gyro and it homes on its own.

⑤ Keybinds (per part)

• Click any activatable part (thruster, launcher, warhead, point-defense, interceptor, decoy).
• Hit Keybind → Press a key. Letters & numbers work; R/Space/Esc are reserved.
• Bind two thrusters to Q and E to steer; bind both to W to fire together.
• Keys are saved inside the blueprint.

⑥ Parameters

• The Inspector exposes sliders/menus: thruster power & activation (hold/toggle/always), launcher cooldown/speed/payload/salvo, warhead detonation mode, seeker range/cone, etc.
• All values are clamped to safe limits and saved in the blueprint.

⑦ Materials & Fire

• Wood is light & weak and burns; Aluminum is light & fire-resistant; Steel/Heavy Armor are tough & fireproof (but heavy).
• The Incendiary Warhead/missile ignites flammable parts for damage-over-time.

⑧ Blueprints

• Save / Export copies JSON; Import pastes it back. Try the Examples on the left.