The Periscope

The Teetering Penguin

The Safe

The Combination Lock

The kaleidoscope

The Merry Go Round

The Sundial

The Catapult

The Chaotic Pendulum

The Jet Car

The Boomerang Wheel

The Rain Stick

The Math Balance

Staying-Balanced Combo set

Measuring Weight & time Combo Set

combo-Forces & Energy

combo - Color & light

combo - Codes & Riddles