It took a while to get from 2off, to 84, I'm not quite sure what I did differently either. Kept being 2 off first time around, came back and saw the bit I'd been missing. Tricky for elementary IMO. Looks good, I barged in and got it 1st time by luck. Nice use of a Sine graph. Didn't find it too tricky, nice level though. I got it on my second series of attempts. I'm not 100% sure what I did differently?? My second time of trying this level, 4off was the closest I could get, then somehow I got it.