I stopped Yousician for a period of 2 months. This is because i felt so **** frustrated when i was learning chords (guitar) in the 3rd and 4th level. It is so **** hard as a newbie to coordinate strumming, finger placing of all 4 fingers and then transitioning to a few chord where i have to do all of that again. I know it sounds silly for anyone who plays the guitar. But this was a really high step to take all at once for me. I was like i was learning to count from one to three and then all of a sudden i have to multiply and divide with 3 digit numbers. It was just not easy and fun. I suggest adding more repetition at the beginning of every song in the learning phase with songs with chords. Perhaps you can ask the learner how many times you want to practice the chords you will play in this song instead of just practicing only once. This will really help build muscle memory and lower the learning curve for this particular phase.