"Tubedoku is a 3x3 grid that you have to fill with six different tube stations that satisfy the descriptions both the row and column. Similar to the New York Times' Wordle, a new puzzle is released every day. Unlike regular sudoko, there are normally multiple possible answers for each square. For example, a station that's on the Central line and has no repeating letters could be Bank or Fairlop, and a station ending in Green and in Zone 2 could be Bethnal Green, Parsons Green or Kensal Green."
"'I've always loved daily puzzles, and one day on the Underground I realised the tube map itself was the perfect theme. Each Tubedoku uses an algorithm to build a fresh puzzle grid around the hidden golden station. It's been amazing to see that others enjoy it too.'"
"When you click on a square, all the stations will appear in drop down menu for you to find the one you're after (technically, this can allow you to cheat and fill the grid out without much thinking at all, but come on, there's no honour in that). If you get an answer correct, the square will turn green. The real challenge is to work out the 'golden station' - the one tube station that meets all six criteria. If you find this one it'll appear on the grid in yellow."
Tubedoku is a daily 3x3 grid puzzle that requires filling nine squares with six London Underground, Overground and DLR stations so that each row and column matches given descriptions. Multiple stations can satisfy individual clues, so players must use intersecting constraints to deduce the correct placements. A drop-down menu lists matching stations for each square, and correct choices turn green. One station meets all six criteria and appears as the 'golden station' in yellow when discovered. Hardcore mode disables the drop-down and forces freehand answers. Each puzzle is algorithmically generated around the hidden golden station.
Read at Time Out London
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