Read the Sudoku help page for the rules, and the techniques potentially required to solve BrainBashers Sudoku.
Intersections is one of the basic techniques people use when solving Sudoku.
![Intersections 1](/gifs/sudokuintersections.gif)
Looking at Block5, where can the <7> go? The intersections of R5 & R6 limit the <7> to R4C4.
![Intersections 2](/gifs/sudokuintersections2.gif)
Looking at Block4. where can the <8> go? The intersections of R6, C2 & C3 limit the <8> to R4C1.
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