Practice
Practice sets.
Twenty-four waters with no date attached, three sets per level. They never change, so you can come back to one, and they do not touch your daily streak. Your progress in each set stays in this browser.
Easy.
Seven by seven, eight to ten sandbanks. Every water here can be solved with the simple local steps Hint knows: a 1 or a 2 with a single neighbour, and a sandbank whose number is exactly twice how many neighbours it has, so every walkway to it is doubled.
Medium.
Nine by nine, twelve to fifteen sandbanks. Walkways you have already placed narrow the room left on a sandbank, and Hint reasons from them the same way it reasons from the numbers alone.
Hard.
Eleven by eleven, eighteen to twenty two sandbanks. Some waters need the one-step trial to open up: a count tried out for one step and ruled out because it isolates a group of sandbanks.