This level is evil defined! It is a redux of the longest level, Demon's Lair! It is apparently bad enough to be "hidden", as in, it doesn't have a full map name. Possibly part of the reason for that is because the player will just respawn where they die due to corrupted spawn points. No matter how you look at it, this level is definitely bad, even for Q2!
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Evil Palace is a Multiplayer level in Q2. This level has the same geometry as Entering Demon's...