This is _very_ smooth and really well done. I've only played a bit of the Solitaire but it's really nice on both desktop and mobile.

I'm curious why you're rewriting it for a fourth time? Am I playing version 3 or 4 right now?

Two potential suggestions:

1. You save the game on pause / tab close, it means I'm not able to continue from another device. Would it be possible to provide some form of "seed" that I could input in my other device to continue where I left off? Not sure if that's even possible, just an idea.

2. Option to toggle between mobile/desktop style cards. I understand the desktop style ones might look a bit small on mobile, but I would prefer it.

Great work and site bookmarked.

Thanks for the feedback! You are playing version 3 right now. Version 4 will be a massive bugfix – I am intending to release it by this Christmas.

"Seeding/sharable link" idea is bound to daily game feature – and this is a next feature pack going out in Q1 next year.

Card switch is also in the roadmap, it is part of the non-existent (for now) settings system.

Appreciate for the kind words! Stay tuned!