There is no way to restore a hint you played by mistake. To earn free hints, you can do the following:
- Share WordBrain on Twitter. Make sure you have the Twitter app installed on your device and that you are logged in to your Twitter account. You can earn up to 3 hints by sharing 3 times.
- Rate the game on the App Store/Play Store
- Watch rewarded videos
- Complete a level in the game!
Keep an eye out for hint pack sales and special seasonal campaigns!