What's a good iOS game that lets you play classic Solitaire but also gives you a shot at winning some actual cash?

Okay, so I was looking for something to kill time on the bus, and I stumbled on Solitaire Royale - Win Money. From a technical standpoint, it's your basic Klondike Solitaire, so no weird UI changes or anything. The card movements are smooth, and I haven't seen any lag, even when I'm on a janky connection. But the cool part is the tournaments. You can enter these and potentially win actual cash. I'm not talking life-changing money, but enough to buy a coffee, maybe. The dev team really thought about the skill-based matchmaking, so you're not just playing against bots. Under the hood, the game seems pretty well optimized; it barely uses 60MB of RAM on my iPhone. Just remember to play responsibly, alright? It's easy to get sucked in, chasing those wins. But if you're looking for a classic game with a bit of a competitive edge, this one's worth checking out.