trademark

when u guys be publishing your games to different places etc , you guys dont be worried if you stealing someones else title of game or trademark etc ?

Well, you get a mail to change your name if you are stealing someones trademark. So don't worry about that.

Apple will not allow your game on the store if there is an obvious trademark or IP infringement.

In theory, it's not a wise move as you are opening yourself up for legal action and damages if you infringe. However only big companies will enforce this as it's a waste of money for smaller developers to fight trivial IP infringements. Especially if your app is not causing any lost revenue to the IP owner.

It's still better to come up with something unique -you will also sleep better at night!