81 Squares 81乗 스도쿠 数独 Судоку 20000 puzzles
from elogicpuzzles.com, originally released 11th July, 2008
20,000 Classic Puzzles! This includes the 10,000 from the first release plus another 10,000 totally new puzzles! Enough so that you may not ever need to buy another game or book again!
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discussion by Sidelines.