Shichi Sudoku

A new Sudoku variant has been greated by DKM Games, called Shichi Sudoku (from the Japanese word for "seven"). It contains 7 interlocking grids along the lines of the previous 5-grid Samurai Sudoku. It's guaranteed to give you a challenge!

Because of the large size of the puzzle, a new popup input pad has been introduced to aid input. This can be disabled if you prefer the traditional input. Keyboard input is also still available.