This glitch works anywhere, but the first and easiest place to do it is at Adam Jensen's computer, which is located in his office at Sarif HQ, after returning from the Sarif Manufacturing Plant hostage situation. Use the discovered Praxis Kit and an earned Praxis point to upgrade to Hacking Security Level 3. Try to collect as many Nuke Programs as possible to help speed up the process. The Nuke Programs can be collected in the Sarif Manufacturing Plant, or while searching and hacking into the computers around Sarif HQ. Before starting a hack, save the game. Hack all optional nodes, or the Network node to instantly complete the hack. Do not exit out of the hack or press a button to complete it; you will also want to make sure you are getting an +XP bonus. While using Adam Jensen's computer, hacking the special reward nodes will get you a +500 XP bonus. When you have acquired the optional nodes or captured the network node, pause the game, and load the saved game created before you hacked. Again, do not complete the hack. When the "Access Granted" window appears, do not select "OK". Load the saved game you created before starting the hack. Then, try the hack again. Repeat the previous steps, and capture every optional node or the network node. The game will keep your previous +500 XP bonus. For your second try, you will get +1000 XP. For your third try, you will get +1500 XP, etc. Do the trick five times to get +2500 XP. Make sure to keep loading and never select "OK" to complete the hack. Repeat this trick as many times as desired to get a lot of XP early in the game. You can always return to Adam Jensen's computer later in the game to repeat this trick, or try it on other hacking challenges throughout the game.