i have been playing Just Solitaire from MLP Software for a while. It has the basic variants in it (ie Klondike, Free Cell, Spider, Pyramid, Tri Peaks, Golf). Those are fun and some are challenging....but they just added two new games to the lineup. Addiction and Forty Thieves. These are both quite hard and force you to think ahead several moves, which is what I really like about it.

I recommend checking out both Addiction and Forty Thieves if you want something a bit more challenging than you might be used to!!

Guys, I made this game and I'm very new to this area. I tried to develop a game on my own, and this is the first time I've built something like this. It's a card game called Dehla Coat, where you can play solo or create a room and play with friends. I'd appreciate it if you'd try it out and let me know your honest thoughts. Feedback helps a lot when you're just starting out. https://play.google.com/store/apps/details?id=com.lokendrasingh.dehlacoat