Escape Lock Type Problem Solving Sites:

Goldilocks (easy): https://sites.google.com/pakuranga.school.nz/threelocks/home

Open the Bifrost (easy/medium): https://sites.google.com/pakuranga.school.nz/open-the-bifrost/home

School bus (hard): https://sites.google.com/pakuranga.school.nz/school-bus/backdoor