N. Sanity Peak's Hidden Gem is in the finale where you run away from the Guardian. After you smash the first Box during this chase, run along the left-hand wall and you'll find the Gem among some ...

Give It a Spin's N.Verted Gem is located at the Timeline Event where the giant round door opens up. Pick up 'Akano through the doorway, then go back and Dark Double Jump to the right to pick up the ...