what do you ask if Lego Mario can't recognize bar codes?

clean barcodes, update applications and firmware, etc.

1. cleaning the barcode: ensure that the barcode is clean and free from stains or scratches, and gently wipe the barcode surface with a soft cloth to ensure that there is no dust or fingerprints.

2. Alignment and distance: Place Lego Mario at a distance of about 5 to 1 cm from the bar code to ensure that the camera or sensor can clearly see the whole bar code.

3. lighting conditions: keep enough light to ensure that the camera or sensor can accurately read the barcode.

4. Update applications and firmware: Check available applications or firmware updates, and Lego will release updates to improve barcode recognition performance and ensure that the latest version is installed on the device.

5. Try its barcode: Use different barcodes to test the recognition function in different products or scenes.