A few compliments and tips...
Hehe...Flash4beginners...the 4 was creative lol. In this paragraph I will kind of compare it to Ultimate Tutorial 2, lol. I really liked how you animated it (you showed exactly how to do everything). I also liked your choice of music, I didn't really love UT2's music. It's actually better than UT2, but the only down side is that it doesn't have as much stuff, just flash, which isn't bad.
The masking part really helped me out, because I didn't know how to do that. Thanks!!
I also found some mistakes. In the motion tweening and the motion guide section it doesnt tell you to make the circle a symbol, which you must do, at least I think so. When you finish the motion tweening tutorial, it automatically redirects you to gamecubicle.net... Also, there are some typos, but since you're from Holland, and English isn't your first language, I'll make an acception. Also, this flash is not appropriate for all audiences, you said FUCK. *gasp* Also, the mouse cursor thing that you use in your animations of the tutorial is a little crooked, not that its a problem.
For the music section, you should tell how to set music to buttons, like in your menu. I already know how to do it, but it would be a help to a lot of people. The individual sound compression part really would've helped me last month because I was scrambling around the forums begging for how to do that. -.-
I hope this helped.
Some other comments---
-Mario's Revenge SE looks cool!
-You have Firefox! Yay!
-I spent over an hour looking at this! It was sooo good!!
-Aww...I only found 3 easter eggs
-This is my longest review EVER, so you better be happy!
-This flash goes into my favorites! (#4!)
-YOU go into my favorites! (#2!!)
-You make the best tutorials in the world!
-Lalala...wasted text space...
-Okay, amazingly, I'm finished.