This is known on Google Play as Brain Games of Riddle IQ Test, the app on Android shows as Riddle Quiz Brain Games, and the logo and splash screen just says 'Riddle'. So a little bit of a mismatch of branding but that's ok! The game is also ok! 160 riddles in a mid-range format with pretty standard graphics and gameplay. If you get stuck on a level then check out the answers here, also note that the developer on Android shows as Lll Studio and Amazon as Droidinvader.