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To answer your question, it's because developers find it easier to bulid on an existing gfame then start one from scratch. It's also cheaper, takes less time and takes less effort, as well.
> You silly boy,
She's a girl. you silly hamaphrodite.
> Bonus wrote:
> You silly boy,
She's a girl. you silly
> hamaphrodite.
thankyou
They have to build on the SNES games or make totally new ones. As was mentioned earilier making a new games costs money, time, effort etc