Width auto-suggests a roughly square board from the square footage — edit it yourself any time you want a different shape (like a narrow walkway).
2. Add tiles
New tiles stack near the top-left of the board. Drag each one out to where it belongs. Rotated tiles still count as the same size — a 12x24 laid sideways is still 12x24.
Selecting tiles
Click a tile to select it. Shift-click to add more to the selection, or drag a box over empty board space to select everything inside it. Drag any selected tile to move the whole group together.