can someone explain please how does it work, i can get it by myself

so i got this got all sigils and stars A world all sigils B world, have no idea how to get B4 sphinx star, B5 obelisk star and B7 pyramid star 24/27 sigils and 7/10 stars C world (didnt get C1 "multiply impossible ascension", C4 "oubliette", "throne room" sigils and C4 "oubliette", C5 "dumbwaiter", "up close and jammed" stars) i dont know how to get C star sigils. A star and B star are ez but i have no stars to unlock A star i need your help guys to finish it :)

i was practicing b3 fan slides and found something interesting :) never saw it b4 (damn i hate this cube stucking so much) btw hello everyone im new here :D