Marking Completed + An Unusual Input Device

The winner is Belarussian Aliaksei Senko whose entry ran all last night, so congratulations to him! Thank you to everyone who entered- this must have used up a lot of your time. I'd also mention Clinton Sheppard's entry as an interesting example as it uses a genetic algorithm. A big please for the future... if your program is long running in a non time critical challenge, output a period or something every 1% to show it's running. Some entries did this, some didn't!

Which input device has a 1024 x 768 infrared camera with built in hardware for blob tracking up to 4 points at a frequency of 100 Hz? It also has a 3 axis 8 bit accelerometer which can measure acceleration upto 3G (+/-) at a 100hz frequency. That means it returns 100 sets of values per second. Interestingly there are over 30 million of these input devices in circulation and you may have one. I have two. No, not an iPhone but a Wiimote as used for playing on Nintendo's Wii.

Developer Johnny Chung Lee has been writing software in C# for head tracking, finger tracking and interactive whiteboards using Wiimotes. There's some fascinating videos along with instructions and of course the software.

• Link to Programming Challenge Twenty Calculate which numbers up to 5 million are prime
• Link to Programming Challenge Nineteen Fill a board with the same digit