Hexadoku October 2011

Confident as you might feel juggling hexadecimal numbers in your compilers or 32-bit microcontroller registers, this here Hexadoku is a different kettle of fish if you rely on sharp thinking and your pencil only. Enter the right numbers in the puzzle. Next, send the ones in the grey boxes to us and you automatically enter the prize draw for one of four Elektor Shop vouchers. Have fun!