Yes, Brain Test: Tricky Puzzles offers a free version with in-app purchases available for additional content and features.

Brain Test: Tricky Puzzles can be played offline, but some features may require an internet connection for updates or accessing additional content.

You can contact support or send feedback through the app's settings menu, where you will find options for reaching out to the support team.

You can manage or cancel your subscription through your device's app store settings, where you can find the subscription management options.