App Name: Elegant Riddles

Description: Do you like riddles? This app has 101 riddles and mind-teasers presented in an “eye-soothing environment”. Elegant Riddles is the largest and most pleasant collection of riddles and mind-teasers, specifically designed for mobile devices. The collection includes  logic games,  puns and teasers, classical enigmas,  math problems,  pattern-recognition exercises.

Cost: Free / Pro $1.93 USD

Developer: BluePixel

Market: Android