we turn coffee into puzzles

Brainfreeze Puzzles creates original logic puzzle books and provides puzzle design services for publications, companies, and events.

Color Sudoku

Naked Sudoku

No-Frills Sudoku

No-Frills Sudoku

Beyond Sudoku

Double Trouble Sudoku

Double Trouble Sudoku

Rainbow Sudoku

Fifty Squares of Grey

Fifty Squares of Grey

Ninecraft Sudoku

Ninecraft Sudoku

Taking Sudoku Seriously — English

Taking Sudoku Seriously — Japanese edition

Taking Sudoku Seriously — Chinese edition

Taking Sudoku Seriously

Jason Rosenhouse & Laura Taalman

Mathematics for Human Flourishing

Games for Your Mind

AMS Page-a-Day Calendar

The Magic of Math

SAS/OR User's Guide

The Addict's Guide to Everything Sudoku

Nest Graphs and Minimal Complete Symmetry Groups for Magic Sudoku Variants

Nest Graphs and Minimal Complete Symmetry Groups for Magic Sudoku Variants

Beth Arnold, Rebecca Field, John Lorch, Stephen Lucas, and Laura Taalman

Minimal Complete Shidoku Symmetry Groups

Minimal Complete Shidoku Symmetry Groups

Beth Arnold, Rebecca Field, Stephen Lucas, and Laura Taalman

Gröbner Basis Representations of Sudoku

Gröbner Basis Representations of Sudoku

Beth Arnold, Stephen Lucas, and Laura Taalman