Either navigate to the snapshots gallery from the main menu and choose Underwurlde, or choose Underwurlde from the game gallery, and select snapshots.
Choose snapshot 1, and try to make your way to the blue gems that spawn right in front of you. It can be a little tricky navigating the enemies, but you can throw knives by pressing or holding
to clear them out of the area before you jump. Killing the enemies also gives you some points. It took me a couple tries, but I’m not very good at these games so there's a good chance you'll get it first attempt.