Expert Train Tracks #5

12×12 · Milo · puzzle 5 of 20

Solving notes

This expert grid starts with 11 pieces in place (including A and B), and its route covers 82 of the 144 squares.

Where to start

Row 11 is completely full of track.
Counting and the two-connections rule alone fix 39 of the 82 track squares and rule out 12 squares.

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

What it takes

Our logic engine solves this puzzle with counting, the no-loop and no-early-finish rules, crossing parity 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.