I participated in a Game Jam where there were judges and prizes and I won an Acer Iconia One 7. Having the exact same problem on that device. Just installed Sonic 2 from my Amazon app library, the game's running at roughly 125% speed for me. I'll need to dig deeper, but I think it's running on Android 5 My two-year-old Asus Memopad 7, also running Android 5, runs the game at normal speed. It's a bummer, because the Asus Memopad 7 won't pair with any bluetooth controllers I have, but the Acer Iconia does, so I'd rather use the Iconia to play something like Sonic 2. Edit: I notice the version of Sonic 2 on Google Play says it's v3.1.5, whereas the one I downloaded off Amazon identifies as 3.0.7. The one on Google specifically mentions fixes for Lollipop. Did Amazon just never update to the latest version?