EXPLORE · 18 PUZZLE TYPES · 5 TIERS EACH
Puzzles.
Eighteen number puzzle types, grouped by how they make you think. Tap a card for rules, strategy, and a worked sample.
SUDOKU FAMILY
Latin-square puzzles — every row and column holds each digit once. Most start here.
Sudoku →
9×9 grid, three rules, infinite variations. The genre's anchor.
Killer Sudoku →
Sudoku rules plus cage sums. Magic-sum thinking on a familiar grid.
Calcudoku →
Latin square + any-operator cages. No 3×3 box rule.
Inequality (Futoshiki) →
Latin square with < and > clues between neighbouring cells.
Skyscraper →
Latin square plus edge clues — count the visible buildings.
ARITHMETIC
Sum and combination puzzles. The clue is a number; the deduction is which digits make it.
Kakuro →
Number crossword — each run sums to its clue, no digit repeats.
Number Crossword →
Across-only arithmetic clues. Evaluate, then place.
Sumplete →
Delete cells until every row and column hits its target sum.
Number Blocks →
Fill empty cells with digits so rows and columns hit their sums.
Countdown →
Six numbers, four operators, one target. Channel-4 numbers round.
PATH & MAZE
Find the route from start to finish — by jumping the numbers, threading the walls, or filling one chain.
Number Maze →
Every cell is a jump distance — hop from start to finish.
Square Maze →
Thread open passages corner to corner. Walls block — no numbers.
Circular Maze →
Route through concentric rings — inward, outward, around. No numbers.
Hex Mazes →
Pointy-top hex grid — up to six exits per cell. Thread the walls, no numbers.
Starlink (Hidato) →
Trace 1 through N² across adjacent (including diagonal) cells.
SHADING & SPATIAL
No new digits — work with what's there. Topology, parity, and constraint logic.
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