Zebra Logic Master

You're John Zebra, a Physics student, and you want Dr. Einstein to be your academic advisor. However, Dr. Einstein always challenges those interested students to solve his test, which only 2% of the world population is able to do it. So you decide to start training solving tests similar to what he proposes. Features: - English and Portuguese languages; - 5 slots to save your progress; - Stopwatch to mark your time; - 15 "Einstein's Riddle" challenge style.