5ud0ku is an entertaining little game that can be played on any mobile phone that supports the J2ME standard. One of the main reasons I like it so much is you can quickly turn it on when you’re waiting for 2 or 3 minutes and just as quickly minimize it when what you’re waiting for is done. To minimize applications on my Sony Ericsson K800 phone, I press the “Back” button for 3 seconds and a menu with “End application” and “Minimize” will pop up. To re-activate the game I just press the red operator button and another menu will pop up listing all running apps on the phone.

The game itself is free with a LGPL license. You can get it at: http://www.getjar.com/mobile/4320/5ud0ku—a-sudoku-midlet-for-sony-ericsson-k800/ You have an option of downloading it using your phone’s internet connection but the game itself is stand-alone and doesn’t require an internet connection. 5ud0ku is very addictive, especially when you challenge your friends to beat your time. It is also great exercise for your brain. If you play frequently enough you will find that the time it takes to complete puzzles will reduce and your ability to concentrate in noisy places will also improve. Besides, they say that idle minds are the devil’s workshop and by playing this, your mind is anything but idle. In conclusion, it’s a pretty simple and free way to avoid boredom and keep your mind sharp.

photo credit http://www.flickr.com/photos/artysmokes/