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It's so Knotty! Building on the success of the original, this advanced version adds more sides, colored strings and easy-to-grasp rubber tips. More challenging than the original, Brainstring Advanced will stretch your puzzle solving skills to the next level.

For 1 players, ages 7 and up.

It's knot your average puzzle! The original Brainstring has fascinated puzzlers for years. Start by randomly arranging the tabs to create a knot in the middle of the cube. To solve the puzzle, maneuver the tabs so that each side has only one color and the knot is untied.

For 1 player ages 7 and up.

Think round, act squared! Don't get your wires crossed, as this one is tricky! Flip each peg into an empty space, but watch out...moving the pegs horizontally on the front, will move the pegs vertically on the back! Plan your moves carefully to get a solid color on each side and solve the puzzle. A true crowd-teaser!

For 1 player, ages 5 and up.

Think inside the box! Cubigami's hinged tiles connect to form cubes; fold them up to solve seven different puzzles! Each puzzle is more challenging than the last. After you fold the last puzzle, you'll agree, it's hip to be square!

For 1 player, ages 4 and up.

This puzzle is maddening addition! Place the number buttons randomly on the ball. Solve the puzzle by matching the dots to the numbers so that all of the dots touching a number add up to that amount. There are thousands of ways to play! It all adds up to fun, you can count on it!

For 1 player, ages 7 and up.

It's Bling for your Brain! This puzzle is a gem! Unravel the gemstone to lie flat. Twist and turn the pieces to return the gemstone to its original spherical shape. You'll be dazzled by the transformation.

For 1 player, ages 5 and up.

Patience is an art. Your strategic skills are reflected in this intricate puzzle. Each cube has a slanted mirror that is used to reflect the image from the side of the tray or another cube. Arrange the nine cubes to create an Escher image. Take the challenge and master all five puzzles.

For 1 players, ages 7 and up.

It's genius from every angle! The classic slide puzzle has become infinitely complex. Angle each mirror to reflect the side of an adjacent cube and create one complete image: Einstein's head or a mirror that reflects your genius face, with a small Einstein in the middle. In theory, this may seem relatively easy, but you'll be pulling your hair out in the end!

For 1 player, ages 7 and up.

Beauty meets brains in this intriguing slide puzzle. The Mona Lisa combines Mirrorkal technology with the classic slide puzzle movement. Angled mirrors inside the blocks reflect off the other cubes. Position all of the cubes in a way that creates one of the two images shown below to win. You'll be all smiles as you uncover the secrets to solving this puzzle.

It's a challenge that's out of this world! Is this rocket science? Spin the planets to line up the colors, but don't space out...a planet can only be rotated if it is properly aligned with its surrounding planets. Once you have a solid color on each side, your mission is accomplished!

For 1 player, ages 5 and up.