What can you build with stuff around your house? Find out!
Check out the latest Top Builder! New challenge coming soon.
Design and build an emergency shelter that can fit one person and is sturdy and easy to build.
Build an airship called a blimp that travels in a straight path across the room.
Design and build a device that can pass above a surface and detect magnetic fields.
Design and build a headphone system to hear an instrument better.
Down to the Core
Design and build a tool that can take a core sample from the center of a potato.
Build a blimp that uses balloon power to travel in a straight path across the room.
Design and build a Ping-Pong carrier and send it down a zip line in 4 seconds (or less)!
Design and build a cushion system that can safely land an egg dropped onto the floor.
Make a balloon hover in one spot and move around when you create air currents.
Roving on the Moon
Design and build a rubber band-powered car that can crawl across the floor.
Build a boat that paddles across the water using the power of a rubber band.
Modify a cup so it can zip down a line and drop a marble onto a target.
Build a handheld device that uses a spinning, motor-driven arm to kick a Ping-Pong ball.
Build a machine that will send a ball at least 12 inches across the floor.
Design and build a device that lets you grab and drop objects from at least 2 feet away.
Design and build a crane and see how heavy a load it can lift.
Dance Pad Mania
Build a dance pad that lets you use your feet to sound a buzzer or flash a light.
Build an Instrument
Build a four-stringed instrument that can play a tune in different pitches.
Build a boat that can hold 25 pennies and stay afloat for at least 10 seconds.
Design and build a shock absorbing system that will protect a spacecraft's landing.
Rubber Band Car
Build a fast, two-wheeled car that is powered by a rubber band and can travel at least 4 feet.
Design and build a robotic arm that can lift a cup off the table.
Invent a way to launch a Ping-Pong ball high into the air.
Design a paper table that's at least 8 inches tall and strong enough to hold a heavy book.
Build an air-powered rocket that can hit a distant target.
Build a structure that has two or more parts and moves in the wind.
Design and build an 18-inch tower that can support a tennis ball while a fan blows on it.
Design and build a battery-operated alarm so small that it’s easy to hide.
Invent a holder for a six-pack of cans that is animal-safe, sturdy, convenient, and easy to carry.
Design and build a device that launches a spoonful of confetti into the air—the bigger the cloud, the better!
Triangle Pop-Up Card
Make a fun triangle pop-up card that will amaze your peers!
Floating Box Pop-Up Card
Create a floating box pop-up to surprise your friends!
Box Pop-Up Card
Delight your friends and family with a card that works in surprising ways.
Float a disk on a cushion of air and play games like air hockey.
Hack a Greeting Card
Surprise your friends with this sound system that you can hide or wear.
Make a string of glowing lights that you can dance with, read by, or wear.
Build a Better Lunchbox
Keep a frozen treat from melting.
Make a mini robot that skitters around the room.
Slam two balloons into each other for a fight to the finish!
Balance a sculpture on the point of a toothpick.
Pop a pom-pom up to the ceiling or across the room.
Get all the treasure you can, using a crazy collector that tests your driving skills.
Play carnival-style games using this power launcher.
Make puppets that move, bend, and twist at your command.
Do the impossible! Pass a stick right through a balloon without popping it.
4-Wheel Balloon Car
Make 4-wheeled, air-powered cars that jet across the floor. Race ‘em. Use ‘em to play games.
2-Wheel Balloon Car
Make 2-wheeled, air-powered cars that jet across the floor. Race ‘em. Use ‘em to play games.
Blast a marshmallow across the room!
Rev up this monster wheel to race it, or do freestyle tricks with it!