The Indiana Jones Blackshirt key and disguise are part of the underground boxing ring you can find, and make sneaking around the Vatican a lot easier. You'll see gates that need the key almost as soon as you reach the area but you won't know about the uniform, or that it's how you get the key, until you find the boxing ring and then the uniform itself.
Even then it's not anything you can get that early on, even with finding the first Blackshirt gate before the Indiana Jones guard house key, which is the first one you actually find.
Indiana Jones Blackshirt Key and Uniform location
The Indiana Jones Blackshirt Key and Uniform can be found at this map location but it's an odd, out-of-the-way dead end to find and looks like a blank spot on the map so you might not even think to explore that way.
To reach it head to the the first Vatican area you entered with the big red Mussolini poster, got the end and take the gate on the right hand side into the Vatican Gardens area in Indiana Jones and the Great Circle.
Head left down this alley below. You'll pass the door to the underground boxing ring on the right, just before that arch, but I'll come back to that as you can't get in without the uniform.
When you reach the Borgia Courtyards at the bottom, take the left turn by the truck and keep going until you see this right-hand turn up some stairs through an arch.
Keep taking the stairs up and you'll eventually come out into a roof area where you can get through a hole in a wire fence. You'll be able to look down in this area below to see some Blackshirts hanging around.
Drop down into this area, deal with the guards and you'll find the Blackshirt Uniform and key lying on a bench by a barrel in front of the tent.
Picking that up will get you both the Blackshirt disguise and the key and allow you entry in to the Underground Boxing Ring.
This is a mission you'll repeat in other areas and later on you'll have to find the Indiana Jones Wehrmacht key and uniform to access a Gizeh boxing ring, but getting that disguise is a little more complicated and requires completing another mission first.
Indiana Jones Underground Boxing Ring
The Indiana Jones Underground Boxing Ring is found at this map location but you can't do anything until you have the uniform found above. Once you have the Blackshirt disguise and are wearing it, knock on the door and you'll be let in.
Inside you'll be able to fight three opponents of increasing difficulty to win ₤80, ₤120 and ₤240 in turn, and 150 adventure points at the end when they're all defeated. You can also buy two Indiana Jones books, Hardboiled 1, which improves your health by merging two bars, and Sawbones 1, which increases your Bandage carrying capacity by one. There are also bandages, bread and fruit in the room to help you heal between bouts.
Indiana Jones and the Great Circle on PS5 will be releasing in Spring 2025
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