User blog comment:Dung Dinh Anh/SECRET LEVEL! LEVEL 6-1!/@comment-5079138-20130728125221

EVERYONE Please stop fighting. This is real. I've tried this before and it works. This is NOT fake.

He shown the cheat engine window (See Youtube video) at 0:14, and I see he hacked it to make it 6-1.

Make sure you back up your PvZ save data.

Now for the steps:

1. Open Cheat Engine

2. On Cheat Engine, click the computer icon, then click "Open file", it should pop up Open file box then go to your PvZ save game directory (usually in C:\Program Files\Plants vs. Zombies\userdata)

3. Open your profile data (user*.dat, asterisk is a number) by double clicking it

4. Click "Add address manually" then type "4" (without quotes) in the  Address box

5. Change the value to 51 and done!

6. Now open PvZ and see if the Adventure level is 6-1. If it is not 6-1 then go to other profile (by clicking "If this is not you click here" and choose other profile.) and see if it is 6-1, if it isn't, keep go to other profile until you get it

This has been tested on old PvZ. I'm not sure that this will works on GotY but try it yourself.