The Explosive Gel was a gadget and occasional weapon. Batman could spray the gel on weak structures and trigger the gel to explode. In combat, Batman could use the Quickfire Explosive Gel, in which he quickly sprayed the gel on the ground. When triggered, any enemy in the blast radius was knocked to the ground. The air powered weapon fires cartridges of highly destructive gelignite (a gelatinous form of explosive,used in the real world mostly for mining). Batman uses small amounts of the gel to minimize collateral damage and not kill bystanders (including himself).
Arkham Origins Incident
Batman had Explosive Gel even by the time of his second year of crime-fighting. In Multiplayer, any enemy caught in the blast radius of the Explosive Gel was instantly knocked out.
Arkham Origins Blackgate Incident
Batman utilized an "Explosive Gel Launcher" to fire gel onto surfaces that were not in direct reach.
Arkham Asylum Incident
Batman brought a supply of the Explosive Gel in the trunk of the Batmobile to Arkham Asylum, which he retrieved after the Joker began his takeover. It was the first weapon other than the Batarang that Batman used. Batman later used it in his fight against the Titan-enhanced Joker.
Arkham City Incident
Again, Batman utilized the Explosive Gel to explode everything that was in his way, from walls to thugs.
Arkham Knight Incident
The Explosive Gel returned in Batman: Arkham Knight, and worked similarly as the previous versions. However, quick firing it shot a small ball of the gel, which could temporarily make enemies dizzy and destroy weak walls from a distance. The small version had no effect on larger breakable walls. Every WayneTech Upgrade only applied on sprayed gel.
That gadget was used to break structures and could take down armed and unarmed thugs when it was used in collaboration with a structurally unsound wall. If a single spray of Explosive Gel was set off on a normal, structurally sound wall, the thug would only be knocked down and be made vulnerable to Ground Takedowns. Explosive Gel could be used to stun or take down thugs, confuse Titan-bosses, and destroy weak walls.
Batman: Arkham Asylum
Retrieved from the trunk of the Batmobile, upgrades to the Explosive Gel could be bought with XP through the WayneTech Upgrades Menu.
Explosive Gel Upgrades included:
- Auto Proximity Detonation - Exploded when an enemy got near.
- Multiple Frequency Detonator - Zoomed in on a specific gel patch to detonate only that specific patch.
Batman: Arkham City
The Explosive Gel worked in the same way as in Batman: Arkham Asylum, and all the upgrades that were available then were already in place at the start of the game. The Quickfire feature was introduced, which allowed Batman to apply it quickly on the ground. It was used more prominently to destroy the twelve Titan Containers around Arkham City.
Batman: Arkham Origins
The Explosive Gel worked the same way as it did in Batman: Arkham City.
In City and Origins, using the "Freeflow Gadgets" upgrade, the Explosive Gel had a much larger blast radius, which could, in turn, knock more enemies down. In Arkham Knight, using the Freeflow version of Explosive Gel made Batman shoot a ball of the gel to an enemy, but instead of the normal timer, it exploded instantly, and made all enemies in close proximity dizzy.
- If the player purchases the instant takedown upgrade in Knight, blowing up weak, wooden walls would result in an instant takedown, even when used against Minigunners, who aren't normally affected by the upgrade. This is extremely useful if the predator room doesn't have any traditional, strong breakable walls.
- In City and Origins, If one managed to perform a Special Ground Multi Takedown after using special combo explosive gel, they could potentially knock out entire rooms of enemies in a few seconds. This is easier in Origins, if the upgrade that allows using two special moves in freeflow focus is purchased.
- While Batman tended to spray Explosive Gel patches in a crude bat shape, Robin sprayed his patches in his trademark "R" symbol. Nightwing, as Robin, sprayed his in a crude bird symbol, and Azrael sprayed his in a cross, the symbol of The Order of St. Dumas.
- Originally, in Batman: Arkham Knight, Explosive Gel was only going to be used in context-sensitive areas and not chosen by the player on a gadget selection display.
- In Arkham Knight, Quickfire Explosive Gel behaved very similarly to the Concussion Detonator from Batman: Arkham Origins, as it took a second to explode, and made the enemies dizzy.
- It is likely that Batman had various other explosive gels for other uses, as he used one filled with the cure and one filled with gel when fighting TITAN-infected Joker.
- He also extracted Ra's blood with the explosive gel, yet he could use gel before delivering it to Freeze.
- Joker Teeth, used by The Joker
- Proximity Bomb, used by Deathstroke
- Jack-In-A-Box Bomb, used by Joker's gang and Harley Quinn.