None yet, I just got to level 10
Edit: 1 now, for Portal 2
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Two, I think it was one for 'Really big sky' and one for 'Trine 2'.
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got 1 for dont starve and still dont know what to do with it
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Actually your badge level doesn't matter at all. It's your steam level alone that increases the chances of booster packs by 10% per 10 levels. Not that it matters much... as (for e.g.) a 0.00003% chance (lets say because your steamlvl is >50) won't let boosters rain compared to the equivalent 0.00002% chance (if you were below lvl10).
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I'm level 10: found one for Trine 2, one for Strike Suit Infinity.
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1st one soon after booster packs were implemented, a SMB one. 2nd booster found 2 days ago, a Triple Town one.
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So far i've found 8. ( + made 9 with one foil. )
How can I get a booster pack?
Once you have received all of your card drops, you become eligible for a booster pack, which is a set of 3 trading cards that may include both basic and foil cards. Booster packs are granted randomly to eligible users as more badges are crafted by members of the community. Make sure you log in to Steam each week to maintain eligibility.
Once eligible, your Steam Level increases your rate of receiving a booster pack drop: Level 10: +20% increase in your drop rate Level 20: +40% increase in your drop rate Level 30: +60% increase in your drop rate Level 40: +80% increase in your drop rate Level 50: +100% increase in your drop rate (i.e. the rate has doubled) Etc.
Info grabbed from IronMaiden666 - here
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