Connect the numbers without leaving a corner behind
In the first tutorial, the mouse has crossed the top row from checkpoint 1 to checkpoint 2. Checkpoint 3 is next, but the route must eventually visit every open square.
Start at 1 and drag through adjacent squares to reach 2. Move horizontally or vertically.
Continue toward 3 in order. Before turning, check that the route will still be able to reach every unused square.
Do not cross or reuse the path. Drag back along it to undo a move and try another route.
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