Honestly, I really didn't like MM10 at all compared to 1-3 and 9. 9 was my favorite mostly because I loved the weapons in the game, every single one was useful. MM10... Not so much. The robot masters also felt a little less interesting for whatever reason, and I didn't enjoy the stages as much either. Honestly, I can't explain it exactly, but I much preferred 9.
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BrunomasterX
SHINE: The man killed an entire kingdom by pissing into their water supply. If that isn't development I don't know what is