Best done with options set to Very Easy, 1 Round, no time limit.
You want to hit Batman with a meter burn Assassin Strike to KO him.
![cn_left](/images/controllerbuttons/Xbox%20360/cn_left.png)
![cn_right](/images/controllerbuttons/Xbox%20360/cn_right.png)
![cn_B](/images/controllerbuttons/Xbox%20360/cn_B.png)
Make absolutely sure that Batman has enough health to survive the first hit. If he gets KOed by the initial strike, you can't hit him with a meter burn.