I'd certainly say Ripley's is right up there, Atlantis is a challenge to get to, and then the Frog wizard mode is pretty tough too.
Completed six letters last night, pulse pounding, drained during the seventh mode. That's one thing I like about RBION, you have to shoot during modes, you can't just time them out or it's little more than at best a two ball multiball for few points.
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