1) A very nasty passage. Only attempt to get into if you have lives to kill. It's located just to the right of the start. I found that you can't get into it if you stand on the disappearing platform above the entrance - you'll have better luck if you jump straight up from the central platform and then try to get in as you fall down. To get out, you'll need to take it at a run.
(Discovered by email@example.com).
2) A rather unavoidable passage which drops you back down to the start. At least you get an orange gem out of it.
3) This one is just below the exit.
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