Cross-Platform Challenge Game App

I’m building a head-to-head party game inspired by “Seen Jeem.” Two teams pick five to eight categories, then race through a mix of trivia questions, physical tasks, and quick mini-games; the side with the highest score wins.

Here’s what I need:

• A single code-base targeting both iOS and Android.
• Lightweight onboarding with the choice to create an account or jump straight in as a guest.
• Lobby flow where players form two groups, select categories, and launch the match.
• A challenge engine that serves randomized trivia, triggers phone-based physical tasks (e.g., accelerometer shake, selfie proof), and short mini-games.
• Live score tracker and clear win screen.

For this first phase I’m looking for a functional prototype with clean, modular code and placeholder art that I can later skin. If we work well together, I’ll expand the scope into polished art, additional categories, and backend scaling.