Argh audiosurf ticket...
Not technically hard, but after trying a few songs, the one I got it on was one where the track was bouncing all over the place XD (stratovarious - destiny)
It helped to play as the medium level pusher, as it apparently has 8 rows vs the pointer's 7. Plus, on medium there are purple blocks which means less chance of accidentally making combos when lining the blocks up.
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There is no shame in not knowing; the shame lies in not finding out