i can only up to c7 so

c2 - 10 is kind of interesting with the holes but might be long
c3 - 3 has a good catch though a hole but alot of filler
c3 - 6 you can make it so you have to go through this hole and catch, its kinda hard
c4 - 1 pretty fun as is imoc
c4 - 3 short and sweet
c4 - 4 this one looks intersting but cheatable so im not sure, worth a mention
c4 - 5 remove filler parts and its good i think
c4 - 6 the hole is pretty aids but if you remove the filler it might not be terrible
c4 - 7 remove some of the filler
c5 - 2 its kind of all filler but i enjoy the part where you pogo down on the beams
c5 - 3 could maybe turn this into something less long
c5 - 4 has good pogo imo if you just include the part where you have to go down
c5 - 6 interesting i think
c6 - mostly all of them are good but just remove the filler parts
c7 - 2 this one is actually fun imo