Stack 3D

A 3D block-stacking game for one or more players. Tap to drop the sliding block onto the tower — overshoot and the overhang gets trimmed off, miss entirely and the tower's done.

What you can do

• Drop blocks by tapping at the right moment as each block slides across the top of the tower. The closer to perfect, the more block you keep for the next layer.
• Choose a mode in the lobby — competitive (last player standing) or collaborative (everyone shares one tower).
• Add bots to fill out the lobby; the server picks their drop position with a touch of jitter so they're beatable.
• Watch live — every drop, slide, and trimmed sliver is synced, so spectators see the tower grow in real time.
• Track scores per player as the tower climbs.

Built on Synced-Store

The tower's top layer, the active sliding block's animation parameters, the per-player scores, and the event log are all in synced-store. Slides are rendered client-side from slideStartedAtMs so every player sees the same block in the same place at the same time without the server streaming per-frame updates.