How to Solve the 44-Letter Puzzle in Blue Prince If you get into ... you will be able to open eight locks with four-number date codes. For example, the Boudoir safe's code is the date of Christmas ...

From age-related puzzles to tricky optical illusions and mind-bending number games, brain teasers are a fun way to test your problem-solving skills. But when it comes to maths brain teasers ...