A series of Sequential Discovery (SD) puzzles with the goal of freeing the coin(s). You'll need keen observation, hidden tools, and plenty of thinking to solve these

While mazes seem straightforward (navigate from start to finish, or remove a panel), they can be designed to disorient even the best puzzle solvers

Take the basic 3x3x3 cubic put-together puzzles and turn up the difficulty. The tunnels present in each piece must be aligned to make a continuous pathway