BRAIN TEASER PUZZLE Various styles to satisfy your adventurous spirit. Progress through levels from easy to challenging, allowing you to challenge yourself in a gradually escalating manner! Exquisite Gift: WThese 3D metal puzzle brain teasers make excellent gifts for family, friends, classmates, colleagues on occasions like Christmas, birthdays, holidays, and other special events. They are also suitable as game prizes, classroom rewards, and more. Metal puzzles x13