These are special stages from Demo 4.35 and Final Demo 1.09.4, edited to look nicer and be more lenient, similar to 2.2's current multiplayer special stages.
But, unlike 2.2's mp special stages, which only retextured the special stages to look like the main zones, this one adds slopes here and there to better sell the 2.2 aesthetic.
In terms of which ones are which.
MP Special Stages 1, 2, 3, 6, 7 (Demo 4.35)
MP Special Stages 4, 5 (Final Demo 1.09.4)