Tap where you think Zulrah will appear next then select which form it will appear as (e.g. Range/Mage/Melee). Practice the rotations, then smash the boss in the real game!
It also includes a drop simulator that allows you to see what you would get if you killed Zulrah. The drop rates are incredibly similar to the ones in OSRS.
You can also simulate things such as 'How many kills would it take until I got a pet?', and it would also tell you what drops you got along the way to getting a pet.