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I plan on farming Act 1 for a while, as I've done so much Act 3 farming I'm quite bored with it.

I've added Fields of Misery to my farming path once I get 5 NV stacks, so I can get my first key.

However, once it drops, will I be able to continue farming more Act 1 keys? I want to be able to use 3 Infernal Machines at once, to ensure that I get one of each combination of bosses, but I'm not sure if I can have more than one key at a time.

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up vote 7 down vote accepted

Yes, you can get multiples of the same key before you craft the Infernal Machine. Keys are stackable, though I'm not sure what the maximum stack size is.

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at the minimum they stack to 100 like gems I believe. The inferno machines are stackable too. – l I Oct 17 '12 at 22:28

You can only open one portal per game though, guess they didn't want you to be able to force all 3 types to open like with the sub-uber portals in D2.

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This is completely wrong. You can INDEED open all three portals in a single game. – Frank Oct 22 '12 at 2:19

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