This looks nice but the initial sign-up barrier seems unnecessary. I don't want to create an account and validate my e-mail address before knowing what the challenges and the app actually are. This also introduces a 30s to 2m window until the confirmation e-mail is delivered.
It might improve the flow to first letting them play a challenge (does not have to be daily challenge, e.g., just the demo tetris-like game from the starting page) and then introduce the account sign up afterward.
It might improve the flow to first letting them play a challenge (does not have to be daily challenge, e.g., just the demo tetris-like game from the starting page) and then introduce the account sign up afterward.