Practice
Practice sets.
Twenty-four lakes 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.
Six by six. Every lake here can be solved with the simple local steps Hint knows: a black swan against the edge or in a corner, both arms of a black swan running straight through the next cell, and a white swan against the edge running along it.
Medium.
Seven by seven. The same local steps and the patterns between neighbouring swans, on a slightly bigger lake.
Hard.
Eight by eight. The hardest lakes lean on the short-loop check and a one-step trial: try a step, see where it leads, cross it if the swans cannot agree.