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[spoiler]Use Microsoft Paint.[/spoiler]
I totally didn`t cheat or anything.
Summer school, here I come...
[spoiler]The way to do it is:
Click along the top row, making it so the majority of each column is clear. Then click down the first column for rows where the majority are checked (only those few). Now click on the few remaining boxes which are still checked, and uncheck, before clicking on the corresponding box in the far left column. Do these individually, so you are unchecking, and then checking in the far left each time. Then all you need to do is click along the top row again to clear the full rows. Easy.[/spoiler]
(Now done hard in 47 seconds. Ranked #52)
Passed easy in 49seconds. Rank #457
o, and unchecking the boxes counts as a win, too.
that was idfficult