Rules: Place the five different tetromino shapes, once each, such that they do not touch each other, not even diagonally. The shapes can be rotated and reflected. Then, draw a single loop whose path is horizontal or vertical, such that it passes through all the cells. The loop has to pass twice through (intersecting itself) five cells – one cell per tetromino – and goes straight through on every pass. The rest of the cells will be visited once. All five cells of intersection are given as shaded cells. The loop has to either pass straight through the remaining three cells of each tetromino, or turn in all the three cells. Given letters indicate which tetromino shape occupies that cell.
About: "Coils and Shapes" was invented by Anurag Sahay.
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