Gauntlet (NES)/World 4

The world of the Unseen holds a formidable challenge. Could you possibly be blind? The walls are not there yet they are in this watery world.

Level 63
Few of the levels in world four, the sea level, contain invisible walls. This is one. Not only is it an invisible wall, it's a labyrinth. Most move in a catacomb sort of way.

Level 64
Another invisible wall level. Remember, catacomb like.