At Sinix's request I included a bevy of hidden rooms for you to find. You may not know the references, so this section explains them.
- I actually don't know about Floopsy. You'll have to ask Sinix.
- Labs, especially the underwater kind, appear in many KS levels. The most notable one is Nifflas' An Underwater Adventure.
- Gustav is a real-life acquaintance of Nifflas who was featured in Gustav's Daughter.
- Loaf is a Fact Toast appearing in Through the Swamp. He has somehow managed to steal the hearts of KS players the world over with his simple appreciation for trees.
- xZilas is a level author with a penchant for lizards. xZilas likes to hide lizard themed rooms in their levels.
- Sergio Cornaga and other level makers like to hide a certain pop-up creature in unexpected, hidden, or hard-to-reach places. In LPChip: Hooray Fun Time it was called a mole and given a village.
- Nifflas includes a sheep drawing as an Easter egg in many of his games. I don't know its significance myself and I hope I've not made myself the target of some secret society for hi-jacking it.
Bonus Fact: Harumbai made music specifically for KS, but it was never used. It was nearly lost and forgotten, just like
Island of Mimir. I find it incredibly satisfying to have it included in this level and fit so well. Harumbai was also glad to hear of its use.