Mega Monster Sandbox 3D

Build, craft, drive, and battle giant monsters in a 3D voxel sandbox. The solo Expeditions expansion adds two compact arenas, two replayable objectives, and a dedicated field kit.

Solo Expeditions

Rustwater Basin has acid channels, industrial bridges and sealed vehicle protection. Skyglass Causeway has terraced paths, gaps, launch pads and rescue transit. Play either arena in Crystal Relay: drill or shoot three crystal shells, tether the cells, then deliver them before 120 seconds. In Reactor Defense, stop three siege drones and keep the reactor alive through stabilization.

The Prism Lance pierces aligned targets; Burst Mortar damages a group with splash. Magnetic Tether pulls exposed cells, while Repair Beacon restores reactor and pilot health. Spend field charge and refill it at the reactor dock. Drive a slow, armored Quarry Crawler with a free excavation drill, or a fast Gale Skiff that dashes and glides over acid and gaps.

Expeditions are solo only. Launch safely, begin when ready, use free transit pads, restart a fresh run, or return to your preserved sandbox. Field equipment and summoned vehicles stay in expeditions; selected field loadout is saved, but active runs are not.

Sandbox and online play

The original four biomes, voxel building/mining, crafting, eight-slot arsenal, jetpack upgrades and six machines remain available. Machines opens the Cyber Rover, Battle Mech, Aero-Jet Fighter, Heavy Rotary Blaster, Anti-Grav Hoverbike and Sentry Turret.

Solo heroes fight alone; Titan and Behemoth ally with AI monsters. Online Co-op supports a hero squad of five. Online PvP supports Cyan Heroes and Rose Monsters, five per faction (ten total), all with 100 HP. Shared mounted machines, sentries, faction protection and monster ally commands remain available. Parked machines and placed blocks are personal; online machines are recalled on exit.

Controls and saves

WASD moves/drives; mouse or drag looks; left click attacks/mines. Space flies or uses a vehicle special; F exits. Expedition panels offer target selection, field gear, transit and objective controls. In the sandbox, M opens Garage, E crafts, 1–8 selects gear, B/X places/breaks blocks. Save preserves blocks, gear, upgrades, role and selected expedition kit. Save & return safely leaves an expedition before saving.