Drag mouse to move or select Double-click on a hand tile to discard
Press D to discard hovered/selected tile
Press F or right-click to flip or rotate
Press R to rotate backwards; for example hide your hand
Press S to sort your hand
Hold SPACE (or press Q) to look down
Hold Z to zoom in
Hold X to zoom out
Press M to meld selected tiles
Press P to toggle perspective mode
Press L to toggle tile labels
Press D to draw/discard
Press 1 to undo last draw (return tile to wall)