With this glitch/trick I've gotten 3 hours of double xp from one 15 minute code!

NOTE: I did NOT find this!

Required:
More than 1 computer (2, 3, 4, etc)
Multiple people to help you (recommended that your all in the same place)
A double XP code


Tutorial:
1. Sign in on dewxp.com on every computer you can (must be the same profile on each)
2. Enter your double xp code on each of them.
3. Now is when you need other people to help you. For every computer your using, have one more person helping you. (so if your using 4 computers have 3 people help you)
4. Now is the tricky part. You and everyone thats helping you must press "submit" AT THE SAME TIME or it wont work. (I recommend that you count down from 3 and say go, then everyone knows when to press the button)
5. If it worked you should see the code you just entered multiple times on your double xp page. (So if you used 4 computers and it worked on all of them you should have 4 of the same code)
6. Now select the codes you just entered and type you GT and click "I acknowledge" and get ready to activate your double xp. Do this on all the computers your using.
7. Now activate the double xp AT THE SAME TIME and it should give you a message saying "success" on each computer.
8. Congratulations yo have now multiplied your code!

NOTE: even if you press the buttons at the same time it doesn't always work. But it does work about 90% of the time.

If you want to do this with codes you've already redeemed then just check them off and follow steps 6-8 (just skip 1-5).

Hope I helped!

Just contact me if you need any help!