Sandcastle Island Builder

# Sandcastle Island Builder — Official AI Game Generator Showcase Prompt

Use this prompt to recreate or remix the playable showcase. The production demo is a static browser game with no backend provider calls.

Build a complete static browser game bundle for an official AI Game Generator showcase.

Title: Sandcastle Island Builder

Create a polished low-poly 3D sandcastle builder that looks strong in a homepage screenshot within the first 3 seconds. The game should show bright turquoise water, a sandy island, low-poly castle pieces, flags, rocks, wave rings, and a clear builder toolbar.

Gameplay requirements:
- The player has a sand budget and places wall blocks, round towers, gates, flags, and moat pieces on valid island tiles.
- Controls visibly change the castle: click/tap places the selected piece, number keys switch tools, Q/E rotates the camera, R restarts.
- HUD shows sand, score, stability, and tide timer.
- A tide test affects stability, score, and game status.
- Restart resets the world cleanly.

Acceptance gates:
- Not a static scene; building interaction must change the world.
- Real 3D browser rendering with visible meshes and spatial depth.
- First frame must clearly show the island, starter castle, water, toolbar, and HUD.
- No remote textures, models, backend APIs, or production provider calls.