[Quartet]

[Nutcase]

[Infinity]

[News]

[Hourglass]

This puzzle is called Infinity not only for its appearance, but also because its movement continues endlessly until the pieces are taken apart. Even though it looks simple, solving this puzzle will entertain you for hours. Brainteasers cast metal brain teasers have 6 levels of difficulty, and each puzzle is Mensa-rated. Level 6 puzzles are considered very difficult by most puzzlers. By Finnish designer Vesa Timonen.