It has text now? "Move the knight to every square, right to left, top to bottom. Don’t land anywhere the queen can take you, and don’t take the queen."
It might not be obvious, but the specified squares are "all the squares in the order right to left, top to bottom without those the queen can attack" as the text instructs.
I didn't actually realize the goal of the game was to do it all in order! The help text just says "Move the knight to every square, right to left, top to bottom."