Well, being a Battle-Out, what you have to do is get the highest score.
FunOrb: Star Cannon is free: http://www.funorb.com
All you have to do is sign up to FunOrb (or use your RuneScape account) and post a screenshot of your score.
Do this in EASY mode.
Entries:
Xmadole (Mh_I)
Wyvern (NPyre)
Maxi (Original Max)
Jake (Direpie)
Needs to try Easy mode. xD
Hiscores:
(only Easy Mode scores count.)