DryRun: a Cambridge pseudocode lab that shows where your reasoning breaks

Field notes

DryRun runs Cambridge-style pseudocode against hidden test cases, then exposes output, variables, breakpoints, and a line-by-line trace so students can locate a reasoning error. Its practice loop includes a diagnostic and spaced return of mistakes, while its converters cover structured English, trace tables, flowcharts, truth tables, and logic circuits. Work remains in the browser, with JSON or CSV export for teachers; clearing browser data removes local progress unless it has been exported.