The mainstream puzzles I will post (Thursday Explosion and Saturday Special) will be Tough, Hard or Very Hard. Should however the generation process result in a Tough and a Very Hard or an even harder puzzle, I might post both. If anyone in addition wants easier puzzles [(Very) Easy or Moderate], please let me know (post, PM or e-mail) and I will see what I can do.
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Rating Techniques required
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Very Easy Naked Singles only.
Easy Naked and Hidden Singles only.
Moderate Easier techniques + Intersections aka. Block/Block Interactions aka. Locked Candidates.
Tough Easier techniques + Naked and/or Hidden Pairs.
Hard Easier techniques + Naked and/or Hidden Triplets/Quads.
Very Hard Easier techniques + Basic Fish, i.e. at least one X-Wing, Swordfish, Jellyfish and/or Squirmbag.
Extra Hard Easier techniques + Advanced Fish and Colouring (includes Skyscrapers and Kites).
Super hard Easier techniques + Wings.
Ultra Hard Easier techniques + Chains.
Nightmare Easier techniques + any other techniques except Pure Guessing and Brute Force.
Hellish Nightmare Easier techniques + Pure Guessing and Brute Force.