# Options * 4 2x2 Arrow Slits * 2 2x2 Grate * 1 2x4 Grate * 1 4x4 Grate * 1 2x2 Trap Door * 1 2x2 Corner Trap Door * Mosaic Floors # Navigation [Instructions](README.md) * [Ultra Basic Set](ultra_basic.md) * [Basic Set](basic.md) <- Start here * [Diagonal Set](diagonal.md) * [Curved Set](curved.md) * [OpenLOCK Set](openlock.md)