I just reached Level 9. It tells me the following: "Good job! You can find Level 10 at our IRC channels. Go to #try2hack.level10 on irc.efnet.org and use 'yu0aertehbomb' as key to continue. See the
chat page for more information.". I'm not going to bother if it's on the IRC stuff etc. I only like doing it with the normal webpage.
For anyone who needs help for Level 8, you can open Chrome Developer Tools with ctrl+j+shift. From there, on the try2hack website you can go to resources > cookies > try2hack.nl > cookie item and it will have auth = no and the username and password. Change it to yes with the console (auth cookie) and then enter the username and password. If you enter username and password before you change auth to yes with the console, it simply won't work. I'm bored with try2hack now, so im going to stop from now.. But that's how you get to Level 9.