I did this cake for a sweet 16 birthday party. My first topsy-turvy cake. I was TERRIFIED something was going to happen to it, like it was going to collapse once I left the party, but it didn't! I have learned several lessons for next time though (like put my borders on at the site). Bottom tier was chocolate cake with oreo filling, middle tier was yellow cake with dark chocolate raspberry ganache filling, top tier was yellow cake with lemon filling.