How to use: Set your tile dimensions and variation counts, then click Generate. Each tile shows a 3×3 bitmask grid — red cells are connected neighbors, white cells are not. The center cell is always the tile itself.
Variations: The global default sets how many slots each tile gets (1 = base tile only, no extras). Override specific categories to give them more or fewer slots. For example, center tiles and straight edges often benefit from extra variations to avoid visual repetition in large filled areas. Leave an override blank to use the global default.
Layout: Multi-tile variation groups are packed first into rows targeting a square-ish shape. Single-tile groups (no variations) then fill the remaining gaps at the end of rows. This produces a tight, near-rectangular layout. Categories stay grouped in order: other → outer corners → straight edges → inner corners → center.
Workflow: Download the PNG template, open it in your art program, and paint your tile art over each bitmask indicator. Colored borders mark variation groups.