Walk: click the view, then WASD / arrows to move, mouse to look, Shift to hurry, Esc to free the mouse.
Dollhouse: drag to orbit, right-drag to pan, wheel to zoom.
Furniture: click a piece to select, click it again (or G) to pick it up, click to drop. R turns 90°, Q/E 15°, Del removes.
Measure: M, then click two points.
1/2 jump floors · V change view.