Skill campaign

Every technique the solver knows, in order — weakest first. Drill each one on real puzzles that actually contain it, then name it in a puzzle's trophy room to unlock the next.

How a stage unlocks

Beat a puzzle. Any puzzle counts — one of a stage's own drills below, or one you've already solved, even from before you ever opened this page.
Open its trophy room. A trophy icon appears at the top of that play's own page only once you've beaten it — it isn't there while you're still solving. Tap it to open the trophy room.
Name what you found. Pick the cell where you spotted it, choose the technique and digit, and submit. Get it right and that stage passes immediately, unlocking the next one; get it wrong and it costs one of three strikes on that puzzle, but never blocks you from trying again on another.

0 of 21 techniques passed.

Naked Single Unlocked — ready to drill. Singles Hidden Single Locked — pass Naked Single first. Pointing Locked — pass Hidden Single first. Box/Line Reduction Locked — pass Pointing first. Naked Pair Locked — pass Box/Line Reduction first. Hidden Pair Locked — pass Naked Pair first. Naked Triple Locked — pass Hidden Pair first. Hidden Triple Locked — pass Naked Triple first. Naked Quad Locked — pass Hidden Triple first. Hidden Quad Locked — pass Naked Quad first. X-Wing Locked — pass Hidden Quad first. Swordfish Locked — pass X-Wing first. Jellyfish Locked — pass Swordfish first. Skyscraper Locked — pass Jellyfish first. Two-String Kite Locked — pass Skyscraper first. Simple Colouring Locked — pass Two-String Kite first. Empty Rectangle Locked — pass Simple Colouring first. Y-Wing Locked — pass Empty Rectangle first. XYZ-Wing Locked — pass Y-Wing first. W-Wing Locked — pass XYZ-Wing first. WXYZ-Wing Locked — pass W-Wing first.

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Playing as guest