A playful illustrated expression factory with conveyor belts and operation machines
Open factoryExpression Factory
Run the route

Keep the written expression fixed

Choose the next legal machine. Only the evaluation trace changes.

Written expression · fixed 2 + 3 × 4 − 1
DROP MACHINE HEREthen pull the crank
Evaluation trace · evolving 2 + 3 × 4 − 1
Choose one machineThe source rail will not be rewritten.