Complete solution with answer and video walkthrough
There it is The Red Power Gem
Tap on the red gem. Then drag it to the mummies to kill them.


Who dares to enter King Tontokamon’s Pyramid

Captain Mary must protect her ship against the waves

I must proceed with caution

(Gundolf Puzzle) Help me pair my cards

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

(Bonus Level) Gundolf must brew the golden potion