Click
Place the piece where the ghost is
⇧+Drag
Paint a straight row of pieces (locks to the first direction you move)
⌘+Drag up
Build a column: each bit of upward mouse travel adds a piece on top
← → / R / Space
Rotate the piece you're holding
Right-click
Remove the piece under the cursor
⌫ / X
Remove the piece under the cursor
Tab / ⇧Tab
Next / previous toolbar group (bricks, plates, tiles, slopes, round)
1–9
Pick a piece in the current group
⇧+1–0 or [ ]
Pick a color
⌥+Click
Copy a piece's shape and color (eyedropper)
⌘Z / ⌘⇧Z
Undo / redo
Build something
Pick a model, then Build along to do it step by step
Blue outline
The suggested next piece; the darker outlines are the few after it
The box
Exactly the set's pieces with counts — pick with 1–9 / Tab, or drag one onto the table
Physics
A piece must rest on something (or hang from something already placed) — no mid-air
Green outline
Your ghost is on a correct spot — click to place
Assist
Wrong piece or wrong spot buzzes and won't go down
Free build
Anything goes; pieces that don't belong get a red outline
P (hold)
Preview the whole finished model
N
Place the next piece for me
Colors
Suggested only — any color counts if the shape and spot match
Share the invite link — everyone in the room builds on the same table, live. Click your name in the people list to change it.