Practice
Practice sets.
Twenty-four setts 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, numbers 1 to 6. Every sett here can be solved with the plain steps Hint knows: a cage of one cell, a total that can only be made one way, and the single number a cell or a line has left.
Medium.
Nine by nine. Marks you have already placed start narrowing what a cage or a line can still hold, and Hint reasons from them the same way it reasons from the cages alone.
Hard.
Nine by nine. More row, column and block totals, pairs and narrowed cages before the sett opens up.