Unlock ridley as a usable boss in all areas.
Uses cheap coding to allow for multiple ridley.
Not gonna explain, just look at the code to set it up.

$102 bytes free space bank $A6.
It's not optimized to keep it simple to use.

Also it's set up for 8 areas, with scaling values for testing purposes.

With some creative thinking, this can be applied to all enemies.
Maybe they'll get stronger the longer game time progresses.