Build game systems

Make placement feel instant while the server stays in charge.

Preview a grid item on the client. Let the server repeat the math, own occupancy and decide whether anything enters the world.

Roblox · Grid Builder + Game Core + UIKit

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Grid placement · explanatory diagram

Client previewSnap the placement ghost

Build.Grid.snaplocal plot grid

Server decisionRe-run the rules

Placement accepted

✓Footprint stays inside the plot

✓Target cells are available

✓Project policy approves the item

Build.Grid.snap(desc, worldPos, rotSteps)BuildServer.place(player, plot, objectId, col, row, rotSteps)

Switch scenarios to inspect the responsibility boundary. This interactive diagram explains the shipped API pattern; it is not a recorded game run.

Shipped foundation

One feature, clear ownership.

Grid Builder shares grid math across client and server. Define the placeable catalog and honest footprints first; add economy costs after placement feels right.

Grid Builder Game Core UIKit

Grid Builder · README API shapeRoblox

-- client: preview in the plot's local grid
Build.Grid.snap(desc, worldPos, rotSteps)

-- server: validate and own occupancy
BuildServer.place(player, plot, objectId, col, row, rotSteps)