The classic blocks that are only solid for Mario or sprites which makes a lot of new setups possible.
This version allows you to make multiple different blocks like ledges and slopes only solid for either just by using 1 asm file.
It also contains settings for whether blocks solid for Mario should also be solid for his fireballs and/or Yoshi and vice versa.
So I remember there was this one message that said, an easy no mario, mario block is no allowed beccause its too easy to make and everyone knows how to make it. well thanks for letting this one pass because I needed it.