Killer Sudoku

A killer sudoku resembles a regular sudoku, in that the aim is to fill every row, column and 3x3 box with the numbers 1 to 9 once only. Rather than providing some numbers to get you started, a killer sudoku gives you the sum total of the numbers that appear in certain areas of the grid. These areas are indicated by a drawn 'cage' and the total appears in the top left. Using these clues can you complete the grid?

Pencil mode can be enabled to sketch in possible solutions for each cell. Hins and other settings can be accessed from the menu in the top right.