I solved a "Hardcore" with two unused canals. Does this mean there's more than one solution? Shouldn't all the canals be used?
Hi Mark, technically this shouldn't happen. This is a slight failure on our part to test every puzzle iteration. If you press and hold the I key it tells you the ID number of the level, so if you see this then let us know the level ID and we'll fix it in a future release. Thanks for playing!