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#3

Hard Train Tracks #3

10×10 · Devious · puzzle 3 of 40

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Solving notes

This hard grid starts with 5 pieces in place (including A and B), and its route covers 46 of the 100 squares.

Where to start

Row 1 is 0, so every square there is empty.
Counting and the two-connections rule alone fix 20 of the 46 track squares and rule out 11 squares.

Rows are numbered from the top, columns from the left.

What it takes

Our logic engine solves this puzzle with counting and a one-step “what if” test. The techniques are explained on the strategy page.

Show what counting alone proves (spoiler)

Orange lines are forced connections, dots are squares that must hold track, Xs are squares proven empty.

Stuck? Check shows mistakes for a few seconds, Hint fixes the next square along the route from A, and Solution shows the whole answer.

Milo Marwick

Logic puzzles and puzzle books by Milo Marwick: Train Tracks, murder mystery logic, spatial reasoning and mystery coloring. Every puzzle is checked by computer before it is published.

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