K, I have gone through a couple lists of Japanese games.. What is with the double wording in games? Does it change or add to the word? Or do they just want to sound dumb?

Really though, is there a purpose?
I speak fluent Tagalog (filipino) and I know that doubling words sometimes adds empesis to what you are saying..

Edited: Sorry this was a little confusing.. Im talking about the double words in Japanese games..
EXAMPLES: DANCE DANCE revolution, Doki Doki etc..