II – To Test Chamber
I – To Library
20 - Puzzle/quest element
1 – The only puzzle on this level. Normally, To complete it, you need the Cursed Compass (map: Castle Nex [1]).
The whole room is covered with invisible portals, which teleport you back to the start. You have to find a way through the chamber, without entering any portal. The Compass that you've obtained two floors below will help you do that. It shows you the locations of portals, so you cannot step onto the field which it is showing you. Moreover, every time you enter a portal, the location of all the portals changes.
On the map, you can see one of several ways to get through the room (yellow squares 1-15). If the road shown on the map happens to not fit the placement of portals, just use it again and again. After some trials, the portals will match the road on the map and you will reach the end.
[1] – Sack: Food X4