I lost the cardboard gameboard squares. Does anybody have a high quality scan of the tiles so I can print them ?
The low-resolution scans available from the BrickLink item descriptions might be enough, though they will require some labour on your part. You can also consider buying second-hand tiles from BrickLink vendors. I don't think there are publicly-available high-resolution scans.
Otherwise, do try contacting LEGO support; they might be able to help with a replacement.