I believe you're mentioning playing True Skate on the Galaxy S5/S6?
Try https://play.google.com/store/apps/details?id=com.phoenixstudios.aiogestures
It's an app I found to be non-intrusive, convenient and helpful. Cheers.
Edit: I forgot to mention what it does. This app allows you to assign 'no action' or essentially disable the menu or back (or any) buttons on your phone.