Drag any visible object onto another shelf with an empty spot. Or tap an object to select it, then tap the destination shelf. You can also use Tab and Enter.

Three identical visible objects on one shelf disappear. Some types have six, nine or more copies; clear every set. When a shelf becomes empty, the next hidden object comes forward into one spot. Some shelves have a queue of two or three. The silhouettes show the next object; the number tells you how many remain behind.

A chained object cannot move. Bring its two matching friends to that compartment; the padlock opens and all three clear together. Undo restores the chain too.

Clear everything to finish. There’s no timer or move limit. Use Undo or Restart whenever you need.