If you'd rather save time than go through the Wayback machine to find some of the backbone content that made Newgrounds what it is, I took the liberty of collecting a bunch in one folder for you here: https://www.mediafire.com/file/kpkpzi5x48liqa6/assassin+crap.zip/file

And if you can't play flash content, I recommend getting flash projector here: https://www.mediafire.com/file/li2xnvz9a43g6v0/flashplayer_32_sa.exe/f