Boost your brain power and detox from the digital deluge with over 100 math and logic puzzles with the greatest riddle solver of all time, Sherlock Holmes. The

Solve it like Sherlock: Generations of readers have made Sherlock Holmes the world's most famous fictional detective. Now, you have a chance to test your mettle

​Solve over 144 puzzles, navigate around maps of London and the English countryside, search for hidden clues, and—most importantly—exercise your sharp int

My mind rebels at stagnation. Give me problems, give me work, give me the most abstruse cryptogram or the most intricate analysis, and I am in my own proper atm

Join Holmes and Watson as they examine interrupted games to deduce prior moves. A series of increasingly complex chess mysteries culminates in a double murder p