Build a 3D castle in your browser
Towers, battlements, gates and moats. BLOX is a free castle builder you play online, with arches, domes, cylinders and cones made for castles.
Play BLOX freeSee community builds →Towers and walls
Cylinder blocks stack into round towers, cones cap them with spires, and a ring of alternating blocks makes battlements. Stone and brick skins give the walls a real castle look.
Gates, arches and halls
Arch blocks make gateways and bridges. Domes make great halls and observatories. Ramps lead up to the walls.
Moats and landscapes
Lay water blocks around the walls for a moat, or pick a snow or sand terrain for a mountain fortress or a desert palace. Plates go up to 96 × 96 for a full kingdom.
Castle challenges
Daily and weekly build challenges often include towers, keeps and forts. Follow the ghost outline, finish the build and earn Bits for new skins.
FAQ
Is the castle builder free?
Yes. BLOX is free to play, with no ads.
Can kids use it?
BLOX is a family-friendly building game. Community posts follow our community terms.
Do I need to download anything?
No. It runs in your browser, Chromebooks included.