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Time-Capsule Sudoku 1

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 3. There is only one square where an 8 can go.

2One numberOpen

Row 3, column 6 is 8.

3Full gridAsks twice

This shows the full answer. Sure?

Yes, show me
864273159
527419368
139658247
758364921
416792583
392581476
683925714
975146832
241837695

The shaded squares spell 1969: the document on page 55.

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

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