Train Track Logic
Train Track Logic gives you an unfinished railway map and asks you to complete the line. James Harvey wrote it as Tracks for Simon Tatham's Portable Puzzle Collection.
You only need a browser to play, so it works on a laptop, phone or Chromebook with nothing installed. Every board can be solved by careful counting, with no luck involved. That makes it a good pick when you want a slow, steady puzzle rather than a race.
How to play Train Track Logic
The route starts at A on the left side and finishes at B along the bottom. It may use straight pieces and right-angle curves, but it can never cross over, split or loop back on itself.
Numbers across the top and down the right side count how many squares in that column or row hold track. Pieces printed at the start are part of the answer and cannot be removed.
Click the edge between two squares to run rail across it. Right-click an edge to cross it out. Inside a square, left-click marks "track here" and right-click marks "no track." Dragging across squares marks many at once. Overfilled lines show their clue in red, and a finished, correct railway makes the grid flash.
Controls
| Action | Keyboard | Mouse | Touch |
|---|---|---|---|
| Lay track across an edge | Arrow keys onto an edge, then Enter | Left-click the edge | Tap with Tap set to Track |
| Cross out an edge | Space on an edge | Right-click the edge | Press and hold, or set Tap to Cross |
| Mark a square as track or empty | Enter / Space on a square | Left- / right-click inside it | Tap / press and hold |
| Mark a row of squares | — | Drag across them | Drag (hold first for crosses) |
| New puzzle, undo, redo | N, U, R | Buttons in the menu bar | Buttons in the menu bar |
Tips
- Settle rows and columns whose clue is 0 or equal to their full length before anything else.
- Every track square uses exactly two of its four sides. Once two sides are crossed out, the other two must carry rail.
- Extend the given pieces immediately. Each points into a neighbor that must hold track too.
- When a line's count is full, drag crosses through its leftover squares to keep the board clean.
- Never close a ring. A loop can never connect both A and B, so it is always wrong.
- Look near A and B first. The line has to leave A heading right and enter B from above, which often fixes the first few squares.
If you like Train Track Logic, try these
Net Pipe PuzzleConnecting a network from scattered pieces stays the aim, turning pipe tiles until all link to the source.
Bridges Island PuzzleStraight lines between points under number limits make this island puzzle a natural follow-up.
Questions
How do you win Train Track Logic?
Build one continuous rail line from A to B that matches every row and column clue without crossing itself. The grid flashes when the route is correct.
What sizes and difficulties are there?
Presets run from 8x8 up to 15x15 at Easy, Tricky or Hard, and the Custom option sets any size you want.
Can I play Train Track Logic on a phone?
Yes. Tap edges to lay rail and press and hold to place crosses. A Tap switch below the board lets taps place crosses instead.
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