Custom Mobile Car Game Development – Full Source Code & iOS/Android Integration -- 3

Summary
I am looking for a game developer or company that already has a READY-MADE mobile game available, preferably a car, fruit, roulette-style, or similar multiplayer game. I am NOT looking to develop a game from scratch. The game must be ready or nearly ready and capable of being customized and integrated directly into my existing iOS and Android application. We already have our own users, backend, wallet/coin system, servers, and development team. The game must support integration with our existing accounts and wallet through API, including balance deduction, payouts, rounds, results, history, and settlement. WebView-only solutions are not preferred. Full source-code ownership is NOT mandatory; licensing is acceptable as long as the game can operate reliably inside our application and integrate with our systems. I am open to a one-time purchase or licensing agreement, but I prefer no revenue share or GGR percentage. Please DO NOT send a proposal to build a new game from scratch. Only contact me if you already have a working game or existing game system. Send me a video, screenshots or live demo, integration method, price, licensing terms, and estimated integration time.