Best Diagonal Little Killer Sudoku Puzzles UK — Top 5 Picks for 2026

A specialist release aimed squarely at Diagonal Little Killer Sudoku solvers, Clarity Media combines precise step‑by‑step tutorials with a curated set of puzzles that escalate cleanly in difficulty. It holds the best‑in‑class spot for this use case because of its targeted technical guidance and digital print quality, trading a slightly higher price for deeper, solver‑focused pedagogy compared with broader collections in this list. For anyone whose priority is mastering diagonal killer techniques rather than sheer volume, this product is the most efficient investment.

Puzzle Baron’s long‑running reputation for consistent, editor‑vetted puzzles makes Volume 3 a market leader for general puzzle enthusiasts who want reliable difficulty progression and clear instructions. While not as narrowly focused on Diagonal Little Killer Sudoku as Clarity Media or Gareth Moore’s specialist variants, it offers solid value and broad appeal at a mid‑range price, making it the go‑to choice for casual to intermediate solvers who appreciate brand reliability. Its main advantage over the larger collections is predictable quality and approachable learning curves rather than sheer puzzle volume or extreme difficulty.

Gareth Moore’s collection is prized for inventive, technically demanding variants and is especially useful for advanced solvers seeking Diagonal Little Killer Sudoku puzzles that push logic skills. It earns its place by delivering craftsmanship and fresh problem types that deepen technique more rapidly than mass‑market volumes, though it typically comes at a premium per puzzle due to its curated, author‑led design. Compared with The Big Book or magazine issues, Moore’s work trades quantity for originality and pedagogical challenge.

This title wins on value: a very large assortment of killer Sudoku puzzles gives unmatched practice hours per dollar, making it ideal for solvers who want repetition and pattern recognition training for Diagonal Little Killer variants. It is less specialized — you’ll find fewer explicit diagonal‑focused tutorials than in Clarity Media or Gareth Moore — but its cost‑efficiency and breadth make it the best choice for volume practice and conditioning. For budget‑minded solvers who prioritize quantity of puzzles over targeted instruction, this collection is the practical pick.