Tracks

from Simon Tatham's Portable Puzzle Collection


If you've been reading this message for more than a second or two, then this WebAssembly puzzle doesn't seem to be working in your web browser. Sorry!

More information

Most modern browsers should support WASM. I've had reports of success from:

If this puzzle isn't working in one of those browsers (or a later version), check to see whether you have any local configuration that might have turned off WebAssembly completely, or some kind of blocking software that might have prevented the WASM code from being downloaded in the first place.

(For example, in Firefox, it's possible to turn off WASM completely by setting javascript.options.wasm to false in the about:config interface. If you've done that, or something analogous in another browser, this puzzle won't run.)

In other browsers, the problem might be that WebAssembly isn't supported at all (for example, Internet Explorer 11), or that a browser update is needed.

If you think that your browser should support WebAssembly, but this puzzle still isn't running, then please report the problem, including as much diagnostic information as you can find.

In particular, try opening your browser's Javascript error console and then reloading this page, and tell me if it reports any error messages.

Also, if your browser has a network diagnostic tab, try the same experiment, to make sure it is successfully loading both of the auxiliary files tracks.js and tracks.wasm.


Complete the track from A to B so that the rows and columns contain the same number of track segments as are indicated in the clues to the top and right of the grid. There are only straight and 90-degree curved rail sections, and the track may not cross itself.

Left-click on an edge between two squares to add a track segment between the two squares. Right-click on an edge to add a cross on the edge, indicating no track is possible there.

Left-click in a square to add a colour indicator showing that you know the square must contain a track, even if you don't know which edges it crosses yet. Right-click in a square to add a cross indicating it contains no track segment.

Left- or right-drag between squares to lay a straight line of is-track or is-not-track indicators, useful for filling in rows or columns to match the clue.

Full instructions | Back to main puzzles page


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(last modified on Tue Sep 14 01:48:08 2021)