Fit Maze by BIGFRAMES FREE

Fit Maze comes from BIGFRAMES. The object is to slide each tile to an exit in the correct order. 
This is an interesting game because each exit can only be used once.

The first thing to determine: which tile will use which exit.  This has to be done backwards because the last tile cannot move until all the other tiles have exited.  The penultimate tile cannot move until all the previous tiles have exited. You get the idea.

I've done 29 levels.
https://apps.apple.com/us/app/fit-maze/id1466923497