One-Sided Pentominoes Puzzle | 18 Piece Mathematical Packing Puzzle | Geometry Brain Teaser | STEM Educational Puzzle

Challenge yourself with the fascinating world of pentominoes!

This One-Sided Pentominoes Puzzle contains all 18 one-sided pentomino pieces neatly stored inside a tray. Your objective is simple: arrange the pieces to fill the puzzle area and explore the countless geometric patterns that can be created along the way.

While traditional pentomino sets contain 12 unique pieces, one-sided pentominoes treat mirror-image shapes as distinct pieces, expanding the collection to 18 unique forms and creating entirely new puzzle possibilities. The result is a richer and more challenging puzzle experience for both beginners and experienced solvers.

With hundreds of possible arrangements and challenges to discover, this puzzle provides hours of engaging, hands-on problem solving.

Available Sizes

Large
250 x 225 mm

XLarge
330 x 295 mm
The Mathematics Behind Pentominoes

Pentominoes were popularized by mathematician Solomon W. Golomb in the 1950s and have become one of the most famous classes of mathematical puzzles in the world. Each pentomino is formed by connecting five equal squares edge-to-edge.

Pentomino puzzles have been widely used in recreational mathematics, computer science, and education to teach spatial reasoning, geometry, logic, and problem-solving techniques. They remain a favorite among teachers, puzzle enthusiasts, and STEM educators because they offer an elegant combination of simplicity and depth.

The one-sided pentomino set expands on the classic collection by treating reflected shapes as separate pieces, increasing both the number of pieces and the complexity of potential solutions.

Great For
Puzzle enthusiasts
Math lovers
STEM education
Classroom activities
Teachers and students
Spatial reasoning practice
Geometry exploration
Family game nights
Gift giving
Features
Complete 18-piece one-sided pentomino set
Storage tray included
Intermediate to advanced difficulty
Encourages logical thinking and problem solving
Excellent educational resource
Great for repeated challenges

Materials
Crafted from durable PLA plastic, a biodegradable and eco-friendly material designed for years of puzzle-solving enjoyment.

What's Included
18 one-sided pentomino pieces
Storage tray

Difficulty: Intermediate–Advanced

About ItemsByCL

ItemsByCL was built around one simple idea: every product should spark curiosity or put a smile on someone's face.

Our puzzles combine hands-on learning with engaging challenges that appeal to students, teachers, hobbyists, and puzzle collectors alike. Many of our mathematical puzzle designs have been inspired by concepts used in classrooms around the world, helping transform abstract ideas into enjoyable, tactile experiences.

Whether you're looking for a brain teaser, educational activity, or unique gift, we hope our products inspire creativity, curiosity, and a love of problem solving.