Immediately head right, jump on the goomba. Stand in the middle of the first platform. Next, jump on the other goomba, thus allowing yourself to get up to the second goomba (be careful here!). Finally, get right next to the floating block and remember: Left Right Middle. THE END
I know this has probably been said at least 9001 times, but I don't like the fact that there's no eraser button. I hate starting over after I've put almost 10 minutes (yeah, I'm lazy) into my work.