What can you build with stuff around your house? Find out!
See the fan favorite in our latest Top Builder challenge!
开户送The Sneaker Challenge
开户送Design sneakers that do not harm the environment when created or thrown away.
Design a building that can survive an earthquake—then put it to the test!
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.
开户送Design and build a headphone system to hear an instrument better.
开户送Down to the Core
开户送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
开户送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.
开户送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.
开户送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.
开户送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.
开户送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.
开户送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.
开户送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!
开户送Floating Box Pop-Up Card
开户送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.
开户送Build a Better Lunchbox
Keep a frozen treat from melting.
开户送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.
开户送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.
开户送Do the impossible! Pass a stick right through a balloon without popping it.
4-Wheel Balloon Car
开户送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!
开户送Rev up this monster wheel to race it, or do freestyle tricks with it!