MM2 - Brave New World

[brell]

Jack is now in room 17499 with a red key and the gold blocks on. As we know now (and confirmed with a look at the map), he cannot go back to TZ1 with gold bricks on and without a green key. But the only red door in sight is the one in the blue room located

northeast

of TZ1. Jack cannot go there with silver bricks on and there is no other red door in sight. So, after having changed back to silver bricks, Jack has a guesswork to do as of where to go with the red key.