ID:157553
 
Is there any way to display multiple z levels at the same time, so you can a mini physics engine and 'jump' through Z levels to make an isometric platformer?
I do believe this is why they invented the pixel_z setting.
All you need to do is create the platform and then displace it using pixel_z (move it up into the air). You can create your own gravity by determining where your feet are and where the platforms are. If you aren't on a platform, you fall.

Easy.