Dot

"Dot" is designed by Akio Yamamoto, who is also behind the design of a number of Cast Puzzles. The purpose is to take the puzzle piece into two separate parts. Initial impression was that "Dot" is similar to Cast Diamond, designed by Scott Elliot. In some ways it is, but in my opinion the solution is harder than the diamond. It took me a bit of tinkering before I managed to split the two pieces. I tried to remember the movements for later putting it back on but the latter was a little more difficult than I expected.