Why do you think Nintendo has survived so long as a platform holder?

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RedKingXIII said:

It's the combination of great games and their handhelds.

Their games alone didn't do shit to save any of their failed home consoles, but their handhelds always are consistent sellers.

What specifically about their handheld systems has kept them successful though, in your view? 

Sony, Sega, Atari, etc made handhelds as well, but their handheld lines died out.