http://gamemakerserver.com it allowed me to make multiplayer game and i learned a LOT from there.
FlyingSausagePro I learned how to create gravitation from him/her.
umairsheikh2002 I learned how to create side scrolling from him/her
Shaun Spaldin I learned all things that you need to know how to create a platformer game, from him! (AMAZING GAMEMAKER TUTORIALS!)GIVE BIG THANKS TO THEM!!!