Choose the right output
The XLSX contains the current grid and a Read me sheet. Supported formulas with successful local results are stored as formulas with cached values. The CSV contains the current displayed values, while the project JSON preserves editable cell text for reopening here.
The check JSON records the five-variant assessment. A workbook export is allowed even when the task is incomplete, because it is a record of your current work rather than a certificate of completion.
Inspect error formulas explicitly
An unsupported function, circular reference or division by zero remains visible in the local result. During export, error formulas are written as literal text so an unrecognized external or active expression is not silently enabled in another application.
The Read me sheet explains the supported functions and export behavior. Open a representative target cell in your spreadsheet reader to confirm its formula and value before using the workbook as a template elsewhere.
Save before leaving
The game does not store a hidden backup. Download the editable project if you want to continue the exercise later, and reopen it through the project input. A CSV is a values snapshot and cannot restore formulas.
Keep practice outcomes in context: six original exercises and finite test cases help rehearse specific skills. They are not a qualification, employment guarantee or substitute for reviewing real business spreadsheets.