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Now go back to the studio and talk to the guard again. Since you're not using a visitor's pass anymore, you'll need to sign in again to get your ID. Once that's done get straight to Millie's Prop Room. The only way she'll let you in is if you answer a riddle for her. Here's where the distinction of the level of difficulty pops up. Each level provides a different riddle so here's the riddle and the respective answer per riddle, for each level starting from the Junior Detective going up.
Junior
Soft as a petal that falls from a tree, the more I dry, the wetter I'll be!: towel
I run all day and never walk. I tell you something but I do not talk.: clock
When you look at my face it's easy to see, you're looking at you when you're looking at me.:mirror
Senior:
Give it air and it will live . Give it water and it will die. : fire
What has a head and tail but no body?: coin
What has teeth but can't eat?: comb
Master:
The more you make the more you leave behind?: footprints
What is full if holes but holds water?: sponge
What has four fingers and one thumb but is not alive?: glove
Solving the riddle earns Millie's respect and subsequently, the chance to explore the Prop Room alone as she will go and unpowder her nose.