I just finished my Top 50 for the year too! It's pretty similar to last year, but there are both old and new games on my Top 50 for the first time. For instance, my #50 is the successor/reboot of a popular series of NES games... any guesses?
You said "series", so I'm going to role out Punch-Out!!, Excite Truck, A Boy And His Blob, Bionic Commando, and many other reboots in franchises with only one NES game.
Thus leaving Mega Man 9 as the best answer I can come up with right now.
Edit: Unless it's Contra 4. I forgot about Contra 4.
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