Like digital 20 questions, Akinator the Genie is an entertaining guessing game that challenges players to think of a character and stump the AI.
iPhone and iPad apps tagged "deductive reasoning."
Logical Conclusion - The iPhone App for Einstein Puzzle Fans
True brainiacs that appreciate and enjoy applying inferential logic to those deductive reasoning puzzles that are known as zebra puzzles or Einstein puzzles will get a gray matter kick out of Logical Conclusion, the iPhone app that challenges players to solve a variety of these riddle-style puzzles.
My Little Eye is Practice in the Powers of Observation
Heads Up Software's My Little Eye is "Where's Waldo?" for the iPhone and iPod touch.
My Little Eye is populated with 11 photographic images and the task is to find 15 to 23 objects that accompany each image.