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Basic Calculator

Add and subtract your own numbers! The + and - rows are set to 15 (1111) and 15 (1111) by default, use tracks to ride over and swap digits to create a number. A 1 is indicated by the switch-track opening right, and a 0 if it opens left. For the result (= row), a 1 is indicated by the switch-track opening up, and a 0 if it opens down. View the solution (using hints) for an example of 6-11. Solve the level by creating a negative number!