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In the end-game screen, there is one item that says: "Boost : Not earned"

It doesn't show any progress, either.

How do I earn a Boost?

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You buy an XP booster for gold. – ewanm89 May 5 '12 at 9:30
You could post that as an answer, actually. – DrFish May 5 '12 at 9:34
up vote 8 down vote accepted

You can buy boosts with Tribes gold. The cost and time the boost lasts are:

(The $30 and $50 packages used to include a free boost, but the boost was removed in lieu of more gold.)

A good point to keep in mind is that making any real-money purchase will give your account VIP status, which permanently increases your XP gain by 50%. This stacks with the boost bonus: Being boosted (2x) and a VIP (1.5x) will triple the amount of XP you would normally gain.

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XP Boosters can be bought with Tribes Gold in the in-game store.

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