As mentioned before, further info about my first app is as below. Please click here for the link.
It's based on the Cocos2dDiceInCup project, but added lots of extra stuffs:
1. 2 players mode
2. Multi-players mode (through Nextpeer)
3. Game Centre support
4. Allows users to change to different characters
5. Bonus for faster action
6. Email support
7. Supports iPhone/iPhone Retina/iPad/iPad Retina
You can also have a look at the Nextpeer Leaderboard from this link.
Please have a try and send me some feedback. I am currently working on V1.01 with extras... Will let you know when it's published.