Hints

Level 1

Try doing it.

Level 2

What's that?

Level 3

Say it!

Level 4

What is that? What is it made of?

Level 5

Seems like you need to brighten yourself up.

Level 6

Get what's not there.

The level I'm on hasn't been finished!

Try SHIFT+CTRL+R, that should help. If it stays the same, try again on another day.