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Song that was in the background:
Say Anything - Less Cute
I was trying to think of an easy way to hack Gemmers -- I tried finding the values or AoB's for the combo vision thing and a few other things but in the end I got lazy and decided to just see how slowing down the game with a speed hack worked -- it went great.
So yeah, just download Cheat Engine, select your flash process (for Firefox it's plugin-container.exe, for Chrome it's one of your thousands of Chrome.exe processes), tick speed hack and change it to whatever you want. 0.1 will pretty much make you impossible to beat, but you could set it higher if you want to be less obvious. But, on terms of being absolutely impossible to beat you could just set it to something like 0.01 or something and by the time you get a few lines added they should have already lost.
Did have one weird side-effect though -- after you do this once, on the next game that thing that counts down three seconds before the game starts will be at like 100, so just set the speed hack to 4.0 and wait a bit for it to go down to 0
TL;DR: herp derp use speed hack