These super tough but not impossible jigsaw puzzles feature a gradient blending of colors.
An infuriating jigsaw puzzle made up of 300 transparent pieces that are almost all the same, clearly double-sided, and there's no reference photo.
This difficult jigsaw puzzle has 300 pieces printed with heat-sensitive, color-changing ink that transform with the mere touch of your warm fingers.
This fiendishly difficult white puzzle is shaped like a milk spill and has no hard edges or pictures to guide you.
These unique 500 piece jigsaw puzzles are double-sided for an extra challenge with a classic photograph of a Frank Lloyd Wright building on one side and the... More
This out-of-this-world-inspired brain teaser toy is a liquid-filled globe with a little astronaut figure inside that needs to land in the footsteps on the lunar... More
A difficult 1,000 piece jigsaw puzzle of a complex labyrinthine maze with pieces that are all green and white.
This challenging 3x3 puzzle cube has all black thermochromic tiles that temporarily reveal their colors with the heat of your touch and then fade back to black.
This funny yet informative children's book teaches kids how to spell, pronounce, and learn about difficult words like Gnome, Ouija, Knight, Psoriasis, and more.
A standard sized deck of playing cards, except each card has a varying level of woozy blurriness to up the difficulty level, plus they make all players begin... More
These crystals are sugar in its purest form, an ideal tea sweetener or just a unique treat.
