To start playing Big Mumbai Game Colour Prediction Game, you need to download the app from the Google Play Store. Once installed, create an account using your email or phone number. After registration, you will need to fund your account to place bets. The game interface is user-friendly, making it easy for beginners to navigate. Select the colour you want to bet on, choose the amount you wish to wager, and place your prediction. The wheel will spin, and if your chosen colour comes up, you win.