Invisible Predator

Invisible Predator is a predator challenge map in Batman: Arkham Asylum.

There are two special variants, Extreme and Cavern of Love (for the Joker DLC)

Default

 * Watch Your Step - Spray the Explosive Gel on the floor to stun a patrolling henchman.
 * Crowd Control - Take down 3 henchman at once with one wall using Explosive Gel.
 * Grate Moves - Take down 3 henchman at once with one wall using Explosive Gel.

Extreme

 * Two for the Price of One - Using the Ultra Batclaw, pull the floor out from under 2 henchmen.
 * Shock Tactics - Appear out of nowhere to surprise a terrified henchman.
 * Tug of War - Use the Ultra Batclaw to pull 3 henchmen off a walkway at once, taking them all out.

Cavern of Love
When played as the Joker, there are no medals, and the only objective is to simply kill everybody and survive.