Classroom STEM challenge picker

Pick a build, test, and reflection challenge

Choose a practical challenge for classroom or small-group use. Each prompt uses accessible materials and a simple cycle: make a prediction, test one change, and explain what the evidence suggests.

Use fictional or anonymous examples only. This picker does not ask for children’s names or save or send classroom information as part of the tool.

Reading without JavaScript? Start with one of these static challenges and print with Ctrl/Cmd+P. The picker needs JavaScript.

Paper Bridge Test

Build between two stable books, test with lightweight objects, and revise one feature.

Supervision: Keep supports low and stable.

Code a Human Robot

Write movement arrows for a partner to follow and debug one step.

Supervision: Clear the path and move slowly.

Foil Boat Freight

Predict how many large counters a foil boat can carry, then redesign it.

Supervision: Use shallow water and large counters.

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