I hope it’s okay to post this here! I just finished this new app, it’s a simple game where you swipe and slash, a la Fruit Ninja. Zombies approach and you tap on them to hear a Chinese word. If you hear the first tone, you swipe straight across. If you hear the second tone, you swipe diagonally upwards, etc. It’s a way for new students to hear the words and try and identify and remember the tones by following the tone direction with their fingers.