Complete solution with answer and video walkthrough
(Bonus Level) Gundolf must brew the golden potion
As the instruction on the wall said, you should mix the pink and green bottles. Then drag it to the red bottle. Then drag to the blue one and finally mix it with the yellow bottle.

This level challenges your problem-solving skills with a unique puzzle. Take your time to observe all elements on the screen. Sometimes the solution requires thinking outside the box or interacting with objects in unexpected ways. If you're stuck, try different approaches and don't be afraid to experiment with the interface.

There it is The Red Power Gem

I must get out of this pyramid

(Gundolf Puzzle) Tap them in order

Gundolf told that the next gem is located in the Stinky Swamp

I must find a way to get past that carnivorous plant

Stop that swamp monster

(Gundolf Puzzle) Catch me 5 bats

Uuuu … What is a beautiful girl doing in this terrible swamp