Rules: Draw a loop into diagram following the gridlines, which does not touch or
cross itself. A digit in a cell indicate the amount of its edges used by loop.The circles in the diagram follow the Masyu-rules: The path must turn at every black circle, but cannot turn immediately before or after. And the path cannot turn at any white circle, but must turn immediately before and/or after.
Background: The puzzle idea belongs to Nils Miehe. He introduced it in Logic Masters e.V, under the Rätsel Portal part. After that I used the idea in OAPC 8. This puzzle is known with two different names, Masyu Rundweg (Rundweg means Fence in German) and Loop the Loops. I assume that Thomas gave the second name when he published it. Friday Puzzle #115 – Loop the Loops, Friday Puzzle #135 – Loop the Loops (DD Part 8)
. Also Prasanna published some in his blog with the second name.