For me, X-men 2 was harder.
But Bubsy is just memorizing the layout or gambling. The game dares you to go fast like Sonic, but there are pitfalls every 2 seconds or you’ll be going down into an unknown area that could either be fine or it could kill you, and there’s no way of knowing beforehand.
I’m not sure if I missed it somewhere in your writeup. But there’s also Castlevania: Harmony of Despair, the multiplayer co-op game.