I've played the game a few times, but I mostly enjoy the mid-range puzzles.
I've done discovery 3-30; the triangles; the rainbow puzzles; Tantrix Extreme; super-5 (except genius); most of Jaapsch's puzzles; the logic puzzles on tantrix.co.uk; discovery 7, 10, 12-14 in the other colors ... (I don't have sufficient patience for genius or the longest loop/line puzzles!).
Basically, I'd like more puzzles :D .
Are there anymore around? I've trawled a good many pages on Google, but I seem to have found most that are around.