Challenges that are possible within the realm of this map:
Pistol + Knife, Reverse Rainbow, Rainbow, and Easter Egg
No Purchase, Easter Egg (The No Purchase is possible via origins staffs and dig sites in BOB)
One Box, Reverse Rainbow, Rainbow, Easter Egg.

Perk Order To Complete The Rainbow:
Juggernog, Vulture Aid, Double Tap, Stamin Up, Snails Pace, Speed Cola, Mule Kick, Quick Revive, Electric Cherry, Whos Who, PHD Flopper

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Secret Weapon
If you get a Disorderly Combat via a Flavor Hexed, there is a secret weapon known as the ''Hero's Flamethrower''. I have played this map constantly for like 3 years and i have not figured out a way to obtain the flamethrower in any other way.
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Things that can crash the game:
Using a Death Machine on a Panzer
Using a Round Robin while looking at a Panzer
Using an I'm Feeling Lucky (rare)
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Tips for Easter Egg Speedrunning:
Rush the pack a punch area, as it will provide the fastest zombie spawns, and every panzer round, go back to the castle and use the electric trap to kill the panzer
Use the fire staff for the boss battle as the charge effect can insta kill panzers.
The fastest route for getting all teddy bears is to start in spawn, then go to the basement, then use the teleporters to get the upstairs teddies.
(My Record: About 26 minutes)
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Glitches:
If you prone on any railing of the castle, you are invincible.
Walking too far up the hills in BOB will end the game, regardless of perks.
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If you have any other questions about the map, contact me at: hew#0149 on discord. i know everything about this map basically.