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Does anyone have an idea to replicate the sentry beam from Super Mario Galaxy 1 and 2?
I would really like to use one...
I know that you can put 2 bullet bills on each side to replicate one, but its extremely easy to dodge.

You could use multiple flame towers to simulate that effect. I don't know a good way of explaining it, except for showing it, but Jumbo did it in his LDC entry. I suggest checking it out.