Get the full Sudoku Skill Builder series in one complete digital bundle. This four-book set includes Very Easy, Easy, Normal, and Hard levels, with 120 puzzles per volume and full solutions included across the series.

Designed as a level-based progression in a more compact format, this bundle works well for solvers who want a structured skill-building series in one purchase.

• 4 full digital PDF books

• 480 total Sudoku puzzles

• Levels from Very Easy to Hard

• Full solutions included

• Complete four-volume progression