http://www.instructables.com/id/Duino-Tagger/

This project is very fun and interesting. It is one of the Arduino project. It is a very hard design but lots of fun. It is a combat game design.

https://www.youtube.com/watch?feature=player_embedded&v=XGbzgo6XhaE

This project is just awsome.It is a bluetooth alcohol detector. First, it can detect the level that u been drinking. It can also help you to find your friend or texi that near you after you drunk

http://www.instructables.com/id/Secret-Knock-Detecting-Door-Lock/

I like this project becasue it is interesting. It is a very fun code and program that increase your door security and it also decrease your door security at the same time. I would like to make one when i have time.