01Core mechanic
Inspect every prison cell, solve its clue and unlock door after door.
02How a run ends
The run usually fails when a move creates isolated gaps or removes the free space needed to rearrange later pieces.
03Opening plan
Spend the first turns reading the full board, identify the non-reversible move and preserve at least one flexible route.
04Common mistake
Do not solve only the most obvious local match; check what that move leaves behind for the following turn.
05Advanced tip
Scan the room from edge to edge before guessing a code; small differences in repeated objects often reveal the intended order.