Tap a structure, then tap the grid
Drag aims the ghost · tap anywhere confirms it
Pinch / two-finger drag
Zoom · pan the camera
× Done chip
Leave the current tool
Click a structure, then click the grid
Place it · repeat to place more
Click / drag empty ground
Select a piece · box-select a group
Shift/⌘+click
Add / remove from selection
Right-click a structure · empty ground
Pick that structure to place more · deselect
Place a FOB first
Each FOB opens a 40×40 build area (areas can't overlap); build inside it
Buildings can't overlap on a floor
Except sandbags, barbed wire, hedgehog & short walls
Drag selection · ←↑↓→
Move · nudge by grid
R / Shift+R
Rotate (snap: 45° · free: 5°) · reverse
F
Mirror / flip selection
⌘/Ctrl+C
Duplicate → reusable stamp
Del / Backspace
Delete selection
WASD / Space-drag / middle-drag
Pan the camera
Scroll
Zoom
[ / ]
Build floor down / up (experimental)
⌘/Ctrl+G · Shift+⌘+G
Group · ungroup the selection
Layers button (top bar)
Z-order, visibility & opacity sheets · Select only touches active layers
Layer row: checkbox · ⌘/Ctrl or Shift-click
Multi-select layers → duplicate / delete / opacity together
Layer row: drag · double-click name
Reorder z-index · rename in place
Go up a floor, then place
Auto-creates a layer for that floor
⌘/Ctrl+Z · Shift+⌘+Z
Undo · redo
V · B · E
Select · draw · erase tool
G
Toggle snap to grid (Edit → Snap)