why is this little FUCKER so hard to solve?

No.11659581 ViewReplyOriginalReport
First time trying this shit, and I've been struggling at this for HOURS, barely making an progress. As soon as I solve one side, the side I previously solved gets ruined. Am I a brainlet? Is this the ultimate and final IQ test? The brainlet filter?

And no, I don't want to look up the solution. That's cheating.