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you do not need the edges for a portal so 8 but with edges 12 and it needs to be aranged like this

any block to the left and right of the two in the center(perferabaly dirt) you stack two obsidion on top of those then you put a block on top of the two obsidion and put obsidion blocks off of that it should look like this

x--x

- -

- -

x--x

x stand for no block needed so improvise if you want and - stands for obsidion.

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12y ago
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Q: How many obsidian blocks do you need for a portal in minecraft?
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