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Time-Capsule Sudoku 2

Sudoku

Help one square at a time. Grey numbers were printed in the book.

TipOpen one step at a time. The answer always asks twice, so nothing gets spoiled by accident.

1Next moveOpen

Look at row 2. There is only one square where a 6 can go.

2One numberOpen

Row 2, column 3 is 6.

3Full gridAsks twice

This shows the full answer. Sure?

Yes, show me
527968134
986134527
341752698
798516342
614283759
235497861
879645213
163829475
452371986

The shaded squares spell 1912: the document on page 10.

Every answer is also printed at the back of the book, with its page number.

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