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Deus Ex: Human Revolution Hints
How can I get the Praxis kit?
1 of 9: Go to the second floor and find the locked door with the level 5 security device.
2 of 9: If you can't hack level 5 devices, you can use a weapon (preferably a shotgun) to blast the door to pieces. There's no one around who'll care.
3 of 9: If you have the "Explosive Mission Pack" DLC, you can use an automatic unlocking device on the security device. (Note that Grayson sells a few automatic unlocking devices, and there's one in the secret stash in your apartment in the Chiron Building.)
4 of 9: Or you can just enter the door's code, which is 2356. (No, I don't know where to find that code in the game.)
5 of 9: Inside, get past the bedroom door using hacking or any of the above three methods. (Its source-unknown code is 8221.)
6 of 9: In the bedroom, you'll need to either hack the iron cage's security device or enter its code. Its door can't be shot out.
7 of 9: At least this device's code is nearby. Hack the computer on the desk to find it.
8 of 9: Enter 3663 into the cage's security device, then open the door and look to the left.
9 of 9: You'll find the Praxis kit in a small cardboard box.