3rd Floor

Upon entering the 3rd Floor, you'll encounter two Watchers. Proceed north to the next room.

In the first room, you'll find a pressure plate with "12" on it. This plate allows you to take 12 steps before a gate closes. Ignore this for now and head west.

You'll find a gate blocking your path. On the south end of this western area, there's another pressure plate with "6" on it.

Step on the "6" plate. Then, move three steps west, one step north, and two more steps west to pass under the gate before it closes.

Just past this gate, you'll find a chest for The Battle of Wits request. Continue through the nearby door.

A cutscene will play. In this room, you'll find the 100% map chest containing the Repulse Alloy key item.

Open the shortcut north of the chest, then open the shortcut leading back to the room with the two Watchers.

Return to the room with the two Watchers and use the shortcut to access the area with the "6" pressure plate again.

Step on the "6" plate. Follow these steps precisely: go south through the door, move along the north edge of the room with the Watchers, go through the shortcut, move west three tiles, and then go south through the gate.

Past this gate, you'll find a Power Spot and another shortcut that leads back to the room with the Watchers.

Go through the door. You'll see two conveyor belts blocking the path ahead. Continue south.

A short scene will play where you press a switch. This moves a piston out of the way but also blocks a path on the fourth floor.

Open the chest south of the stairs to find a Cosmos Dog-Suit.

Ascend the stairs to the fourth floor.