JCO Website (Puzzles for the manual solver)

Welcome!

Guidelines for using this Website

To maintain the integrity of our original puzzles (marked with JCO and some number),

we kindly ask that you give proper credit when referencing them elsewhere.

The primary content of this website consists of the solutions provided for the puzzles.

These solutions are hidden in the hints and often contain the main steps/key ideas.

You are welcome to access them for your personal (i.e., non-commercial) use.

If you found some interesting idea that would like to share, please feel free

to send an email.