Classic N1

Diagonal Non-Consecutive N1

Consecutive N1

Jigsaw N1

AntiKnight N2

Greater Than N1

Kropki N1

Extra Region N1

Windoku N1

Renban Classic N1

Samurai N1

Irregular Diagonal N1

Diagonal N2

Sequence Sudoku N1

Killer N1

Diagonal N1

AntiKnight N3

AntiKnight N1

Untouch N1

Inequality N3