request gamecube beta

There are links to download some beta for the gamecube

 

Sorry dude, you're going to have to be more specific. This is really vague. What downloads are you trying to access?

 

there is some beta of mario or some character nintendo . P.S : me everything is fine

 

In that case check out this:
http://assemblergames.com/l/threads/announcing-the-prototopia-project.52574/

 

Or here: https://tcrf.net/Category:Prototypes

 

Anything first-party from Nintendo is going to be very hard to find. They're pretty sensitive when it comes to that stuff. While I'm sure people have collected and preserved both pictures and video of their games in development, builds will be exceedingly difficult to track down.