click: use the tool · shift-click: erase · Line: drag a row or column · Box: drag its base, let go, move up or down, click (Esc: stop) · shift: lines and boxes clear · plane: [ ] up and down, V turn, Home floor · alt-click: pick up a material · drag: turn · right-drag: move · wheel: zoom · 1-5: voxel size · the arrow marks its front (toward whoever places it)