Cavemen Yule and Bongo have opened a rift into the tomb. They won't let anyone in before the Sun, sorry, Brightball Skinburn will shed its light into the tomb.
This tomb rift is your way out of this place. You should solve other rifts before coming back to this puzzle.
This is the low-spoiler guide for "The big caveman event" puzzle in The Darkside Detective - A Fumble in the Dark. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.