Challenging yet superfun and easy to understand gameplay. My favorite is Megaman 2.

I superlove the Mega Man games ever since I was a kid. Back then, I knew it as Rockman but they are exactly the same. When I was at a school fair, I accidentally witnessed someone playing Mega Man 2 and it got me really interested because of the gameplay - acquiring the weapons after defeating the bosses. When I played it, I got hooked. Then, I explored and played Mega Man 1 then 3 to 6. I was exctatic when I found Mega Man 1-6 on Steam. I could never get enough of the catchy music and cool visuals. If you decide to play this game, it is excruciatingly difficult but highly rewarding. I'm so proud to have completed all the achievements. In Steam many of my rarest achievements are from Mega Man Legacy collection. If you're up to collecting badges and completing the game 100%, I challenge you to acquire all the 24 badges of this game. All the best!