Cool idea, pretty good execution, but your UI is confusing.

1. There's so much happening on the screen between your app's UI and the fake UI with the dark patterns that it's confusing. IMO you should show the objective first, and then let the user click to reveal the fake UI and challenge. For example, simply show, "Challenge #1 — Find the button that actually lets you cancel the subscription." Then have a button that says, "Start Challenge." When that button is clicked, then reveal the UI.

2. Give me some context. If you just say, "Find the button that actually lets you cancel the subscription," that's not really enough. You should set the scenario. "Imagine you're subscribed to an app, but you don't want to be subscribed anymore. So you sign into the app and click the cancel button. It loads a new screen. How do proceed from here to finalize your cancelation?"

3. Don't tell me the answer in advance. Naming the first challenge "Color Confusion" tells me the answer.

4. Don't auto-advance steps. I had no idea that I auto advanced. I changed tabs, then came back, then was scrolling down looking for the next step button. Just let me manually click to the next step as a user. Preferably at the bottom, near the pattern explanation.