Smart Book Marking
Scan a puzzle QR code to load the matching problem, type the answer into the boxes, or upload a clear photo of the page. The marker checks the numbers, the operators, and the final target.
Offline support becomes available after the page finishes loading once.
A clear, well-lit photo works best. Keep the whole page in frame with all four corner markers visible so the page can be straightened before the answer boxes are read.