How do I make Words connect like game

Hi

I am trying to make game like this :

play.google.com/store/apps/details

play.google.com/store/apps/details

I have searched a lot but could not get anything, most of the sample links are not working. How do we connect those words and how to judge weather the words are correct or not? I have no idea how to do it.

Please help me.

Thanks in advance.