Ha! That's how you got here! I'm glad you joined ;D ! The way I joined was through the explore section. You see, I had used PB before the explore section came out. I thought Mario Builder was more fun because the physics were bad and other stuff. So I found PB again and thought "I should check and see if PB got any better". So I got the latest update and wished I had followed it the whole time! I saw that many things were improved and so forth. So when I tried the explore section (at the time only about 3 or four games were available) I saw a forums link. I didn't know anything about forums. So I thought I would check it out later. I had some issues with PB and used the feedback button. I gave ting thing my email or something and somehow he communicated that I should join the forums. And since, I have checked the forums every chance I get!
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