I tried playing MM9 via the legacy collection. It's so hard! Too many spikes, too many pit jumpers, too much difficult platforming, so many bosses you can't shoot, for one reason or another... And what's even worse is how many people call MM9 easy. Each level is short, I'll give you that... But it can be really frustrating. I only beat Concrete Man, Galaxy Man, and part of Jewel Man's stage.