A famous mathematician died alone without family. In his mansion thousands of little boxes with exactly 16 knobs, key holes or switches were found. The local police is clueless about what those boxes contain and more important, how to open them.
Can you help them solve the mystery of the locks? Turn the knobs, switches or press the button until all are open. Beware, the locks are interconnected! For every lock you turn also all locks in the same row and column will turn...