What's a good iOS game that lets you play Solitaire and maybe, just maybe, win a little spending money for the grandkids?

So, my students – bless their hearts – showed me this app called Solitaire Stash. Now, I'm not usually one for games on my phone, but the idea of playing Solitaire, which I already enjoy, and possibly winning some cash? That piqued my interest. It took me a few days to figure out all the ins and outs of the app; why do they hide the settings button there? Anyway, it seems like you can play regular games of Solitaire, but the real draw is entering these tournaments where you compete against other players for cash prizes. I'm not expecting to get rich, mind you, but it could be a fun way to earn a little extra to put towards the grandkids' college fund, or maybe just a nice dinner out. It's surprisingly intuitive once you get the hang of it, even I could figure it out. Just be careful and don't spend more than you're comfortable with, you know? Treat it like a lottery ticket, not a retirement plan.