Hanidoku...

Has anyone else come across this one before? I've just been doing one or two of the isodoku puzzles in the variety book and they reminded me very much of hanidoku puzzles. They are shaped like hexagons, with hexagonal cells, the difference being that in the incomplete rows (i.e. where there may be only 4, 5, 6, 7, cells etc in a row, the numbers in those rows must be consecutive e.g. 1 - 4, or 2 - 5 , 3 - 6 etc and not just 4 random numbers. Quite tricky little things but very enjoyable!