Solving Trividoku

With a single Trividoku puzzle, you have nine spaces in the grid labeled “A” through “I”. Below the grid you have a left side also labeled “A” – “I” and a numbered right side, “1” – “9”. Each item on the left will uniquely match a single thing on the right. When you discover a pair that matches, for example if “C” and “3” match then you can write in a “3” in the space on the grid with a “C”.

When you know the trivia this can make the puzzle fairly easy, just match the numbers up and it’s as if you suddenly had nine more givens in a regular Sudoku puzzle.

It’s when you don’t know or aren’t sure about the trivia matches that a few techniques will come in handy.

The most important thing to do is always cross off your answers once you’ve entered them into the grid. Each digit is only used once, so if you’ve put that “3” in the grid for “C”, then none of the other matches will be a “3”.

If you’re not sure about a match, take a look at the space in the grid where it appears. Often it will be in the same row, column or box as another digit that’s been filled in. Let’s say that you know that “A” will either be 1, 3 or 5 because of the trivia you’ve crossed off. If the “A” space is in the same column as a “1” you’ve filled in and in the same row as a “3” then you know the answer must be “5”.

For a triple Trividoku, where there are three sets of nine matches (A1-A9, B1-B9 and C1-C9), the approach is generally the same however you need to look at each set of numbers as independent groups. Filling in a “1” for A3, for example, has no effect on what gets filled in for B1-B9 and C1-C9.

Thunder Brain puzzles, while trickier, use all the same tips. Just keep in mind that with Thunder Brain, if you make a mistake on the trivia, the puzzle may come out with more than one solution!