Cross-Platform Multiplayer Game App

I have a fresh game idea that doesn’t sit neatly in the usual puzzle, action, or strategy genres, and I want to bring it to life with full real-time multiplayer support.

The finished product must run smoothly on:
• iOS
• Android
• Web

I’ll need end-to-end development—from the first prototype through to store and browser release—using a single codebase. Whether you prefer Unity, Unreal Engine, or another cross-platform framework, the choice is yours so long as you can maintain feature parity across all three targets.

Deliverables
1. Playable multiplayer build for the three platforms above
2. Clean, well-documented source code
3. Final hand-over session covering build, deployment, and basic maintenance steps

Please share examples of past multiplayer titles you’ve shipped and note the backend or networking stack you’d like to use so I can see how your approach fits the project.