Oops, you’re right! It’s not solvable in this state. I will fix that and verify all other levels when I got home! Sorry for the inconvenience.
I can verify everything except Formation 7-10, and maybe some of the randomly generated levels.
Thank you. :)
The way I generate random levels was creating a solved level and then take out some marks. The only thing I concern was multiple answers. If you found anything strange just let me know!