Revenge of Killer Sudoku 4: 150 Of All New Puzzles

Volume 4: The Apex of Cage-Sum Logic

The Revenge series continues to test the world's most dedicated logic puzzle fans. Face grids with absolutely no given digits, relying entirely on arithmetic cage constraints to crack the architecture.

Designed for experienced solvers, these puzzles demand complex subset analysis, cage splitting, and extreme applications of the Rule of 45.

Designed by Dr. DJAPE, a master logician with a PhD in Computer Science, ensuring every puzzle operates on flawless, guess-free logic.