Review Tables

Longo’s Absolutely Nasty Level 4

KrazyDad SuperTough v5 #5

Paul Stephens from Weeks and Addicts

Shortz Ferocious Beware! Very Challenging

Shortz Trickiest Beware

KrazyDad Insane v4 #5  2019

Pitkow GM and Super GM

Pitkow’s Super GMs

Pitkow Expert

Nikoli’s Sudoku X-tremes

Wayne Gould’s Train Your Brain Su Doku Fiendish

Antoine Alary’s More Extreme

Gordon’s Mensa Guide

Weekly Extreme

Snyder’s Sadistic Sudoku

Longo’s Nastiest Sudoku Ever

Carol Vonderman Master Sudoku

A.D. Ardson’s Very Hard v.2

Rebecca Bean Extremely Hard

David Badger’s Hard Sudoku

Manuel Castillo’s  Only Hard Sudoku

Castillo’s Only Extreme Sudoku Updated

Moito Very Hard Highest Rated

A. D. Ardson Sudoku Diabolical

Rebecca Bean Extremely Hard Sudoku v.10

World’s Hardest Sudoku Book

Funster Extremes

Will Shortz’s Hard Sudoku Beware I

James Forest’s [Very Hard] Classic Sudoku

Castillo’s Only Extreme Updated

Lucky Panda [Extremely Hard] Sudoku

PencilPress 500+ Extreme Sudoku

Sheldon Master Class Updated

F__ These Puzzles Are Hard

David Challenger’s Super Fiendish

J.B. Nakamoto Sudoku[Extreme Level]