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.