As a Super Duolingo subscriber, you have the option of enabling Unlimited Hearts. This way, you won't lose Hearts for an incorrect answer while in a lesson. To turn on Unlimited Hearts, follow these easy steps:
1. Make sure you have the latest Duolingo app version.
2. Open your Duolingo app and tap on the Super Duo icon (top).
3. Tap the Unlimited Hearts to turn on.
4. Now you should be able to make mistakes without losing any hearts.
Note: Unlimited Hearts can also be disabled at any time if you choose.