I Wanna Kill the Kamilia 3 - Stage 4

Yikes. This is where the game gets real mean. Reaching the secret area, beating the secret area's third save, and getting the first crystal in Emperor (last area) are all exceptionally difficult feats. I do skip a crystal which requires beating the first 3 saves in Tempest (4th area) without dying. The key obtained unlocks bosses hidden in each of the first four stages which are more difficult versions of the boss rush bosses from Kamilia 2. Speaking of bosses, the boss rush awaits. It's considered the biggest road block in the game. You'll see why.