How do I guide Calvin through the vents?
First you need to talk to the steward about his latest great idea and memorize the map she shows you.
--
Like earlier with the rat (no offense), you guide Calvin through the maze using the arrows, only now Calvin stops only when there's an obstacle in his way. Every time Calvin bumps into the wall, the bulkheads change from open to shut and vice versa. Any black square is a possible exit.
--
Right, up, left, down, left, up, right, down, up, right, down, left, up, down, left.