Crawl

When the game starts, you must kill all three AI by yourself.

Requires some luck, because if any of the AI kill each other, you won't get it.

As soon as the game starts, it will show the four players. Take note of which one you are, and pick a target.

As soon as the cutscene is over, hold the left stick toward your target and press the attack button immediately.

You lunge pretty far, so chances are you'll kill that AI almost every time.

Now there are two left, and here is where luck comes into play. You have to hope they're both coming after you, instead of each other.

If the RNG gods are smiling upon you, it's not hard to kill them one after another. Just remember that you lunge pretty far when you hold a direction and attack, so simply attack them before they get close enough to attack you.

The whole thing takes about 5 seconds to play out. If you were unable to kill them all yourself, quit the game and start a new one. It wont take long if you keep at it.