Monster puzzle
Easter Monster
11.0SE grade
By The Hardest Sudoku Team · Last updated
1
2
9
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5
9
3
7
8
5
4
7
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3
9
8
2
1
The puzzle as published (21 clues). Solution not shown.
- SE grade
- 11.0
- Creator
- JPF (forum.enjoysudoku.com)
- Year
- 2007
Origin and lore
Easter Monster is one of the most famous symmetric monsters, posted around Easter 2007. Its striking diagonal clue pattern made it a touchstone puzzle and spurred research into specialized techniques (Naked/Hidden Double Loops, the 'SK Loop') that exploit its structure. It remains a classic example of high-SE-grade difficulty.
Source: SudokuSnake.com (Easter Monster); forum.enjoysudoku.com (Easter Monster thread).