But how can a puzzle involving just three letters be so excruciatingly addictive?
Maybe it's because the concept is easier than A, B, C.
The idea is to place the letters A, B, C, in the grid so that each letter appears once and only once in every row and every column.
The letters lurking outside the grid represent the first letter seen as you look down that row or column.
Get it? Got it? Good! Like many grid-based brainteasers, the trick with Bacarba is to constantly cross reference in order to work out where each letter goes.
When looking around the edges of the puzzle, keep an eye out for any letter that appears just once in a column or row of outside letters. This tells you that letter has to go in the first square in that row/column.