Awesome Open Source
Awesome Open Source

Hit Notes - Play instruments


Rhythm-based mobile game. Even you don't have any basic knowledge of music instruments, you still can play with falling notes in the game! ✨

Currently available on the Play store.

Get it on Google Play

Main Features

  • Hundreds of songs, from classics of Beethoven, Chopin, Mozart, or Schubert, folk songs to POP/EDM. Will be updated continuously
  • Adjustable difficulty level
  • Adjustable tempo
  • Many game modes
  • Many musical instruments
  • Play offline without the internet
  • Upload your song and play your way

screenshots screenshots screenshots

Project Structure

This is a Flutter mobile game targeting Android and iOS.

The code for the Flutter app is contained in the folder lib and the different native apps are in android and ios.

Extra project assets are in assets.

Firebase config files and cloud functions are in the functions folder.

Prerequisites & Getting Started


To build and run the mobile apps you’ll need to install Flutter and its dependencies. To verify your installation run in the project’s root directory:

$ flutter doctor

Backend (Firebase)

B1. Setup sign-in method

An initial sign-in method needs to be configured.

  • Select your project in
  • Navigate to Authentication
  • Select Sign-in methods and activate Google, Facebook and Anonymous.

B2. Configure firebase app

Next, you’ll need to configure your firebase app for Flutter as described in Add Firebase to an App / Flutter


Follow the instructions in android/

B3. Deploy functions and synchronize storage

Install Google Cloud SDK and run:

$ ./ projectId

B4. Synchronize database

Install, get service account json file, navigate to the database directory, backup/restore database using:

$ export GOOGLE_APPLICATION_CREDENTIALS="service-account.json"; ./
$ export GOOGLE_APPLICATION_CREDENTIALS="service-account.json"; ./

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