Easy way:
Level 1c niv 1
Level 2c niv 2 or 3 for extend life
Level 1b niv 1
Level 2a niv 1
Level 1a niv 1
Level 2b niv 1 or 2 if you lose a life, the cake is in the car jitterbug
Level Final Hades Castle
(This level is intensive for release the 1cc practice this level perfectly and achievement it's for you)
Good luck all shmupers