Logic Masters Deutschland e.V.

Standard infinity loop rules apply:
• The puzzle consists of a series of rings such that each ring has a neighbor to the inside and a neighbor to the outside. The rings form a loop with the outermost ring connecting to the innermost ring.
• Place a digit from 1-6 in each cell such that no digit repeats in a row, column, or any quadrant (marked by bold lines) of any grid made by two adjacent rings.

Standard sum dots and parity rules apply:
• Digits in shaded squares must be even.
• Digits in shaded circles must be odd.
• Clues in diamonds refer to the sum of the two cells touching that diamond.

I highly recommend solving via this Puzzle TV link which lets you scroll through the quadrants in an intuitive way.

This puzzle is meant to demonstrate an advanced technique. For a more approachable introduction to infinity loop, chameleon has published some infinity loop puzzles as well.