Thanks for playing! I really appreciate the feedback.
Re: No Groups
The deck is shuffled and drawn from which means that it is possible to end up with no solution situations. However, if you’re careful with which groups you select and keep in mind which cards you’ve seen so far you can often get all 27 groups. I was able to “beat” it a handful of times. If I had more time, I would have liked to implement a nice algorithm to make the deck less random to provide an “easy”, “medium”, and “hard” mode.
Re: Bug
Unfortunately, I never received the issue you’re talking about with the cards not selecting. If you could reproduce it and take a video, that would super helpful for me to debug it.