We got some information at Beppu station on which buses to take as well as a bus schedule at the foreign tourist information Center. We bought 4 day bus passes which cost 900 yen each and it came with a coupon to save about 200 yen if you want to see all the hells, from about 2100 yen to 1900 yen.
I found 4 of the hells, the sea hell, the mud hell and the two hells that were away from the rest the best ones by far. Some of the hells were pretty lame, but at least they were close by. It was easy to take the bus, but they also offer a tour that runs twice a day in Japanese. I would recommend taking transit as it was easy with the information given, and you can go at your own pace.
It was an interesting experience for at least some of the Hells, and worth the visit if you are in Beppu or nearby Oita.
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