Warning: these are all really hard!
1.
solved by Radius
2.
solved by Radius
3.
solved by Radius
4.
solved by Nortaneous
5.
solved by Radius
6.
solved by Radius
7.
solved by Rhetorica
8.
solved by Radius
9.
solved by Nortaneous
10.
solved by Radius
BONUS:
solved by Miekko on IRC