A. Do you often play computure game?

No, I don't.  ​

(Punctuation)

​

B.Yes that's right.

=> Another way: Your sentence is okay and this is another way of saying it.​

Yes, it is. 

Be careful! D​on't touch.

Simsoon, come here. Look at it.

​=> Corrected : The sentence is corrected grammatically. 

​​(Capitalization)

​(Punctuation)

​