Chocona (チョコナ) is a puzzle type that likely originates with Nikoli. I have adapted it to play on a Truncated Square grid.
Shade some cells such that:
- A filled square may not share an edge with a filled octagon.
- Filled octagons may share an edge, but only if the contiguous area of filled octagons forms a 45° oriented rectangle.
- Each bold-outlined region must have at least one filled octagon.
- Numbers indicate exactly how many cells, octagon or square, are filled in a bold-outlined region. Regions with no number can have any number of filled cells.
All of the puzzles can be found organized in this printable PDF, or in the images below.