I think 5 or 6.
(Super Sanctum TD, Portal 2, L4D2, Demonicon and well dunno anymore^^)
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3.
Each time after getting a level
Warframe
Dead Island
And...I don't remember
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16 so far:
Anodyne (sold)
Super Meat Boy (opened, no foils)
Ion Assault (sold)
Portal 2 (opened, no foils)
Frozen Synapse (opened, no foils)
Saints Row: The Third (sold)
Awesomenauts (sold)
Hitman: Absolution (sold)
Hack, Slash, Loot (sold)
Offspring Fling (sold)
McPixel (sold)
Defense Grid: The Awakening (opened, no foils)
Anodyne (opened, no foils)
XCOM: Enemy Unknown (still to decide)
Counter-Strike: Global Offensive (sold)
Angry Video Game Nerd Adventures (opened, no foils)
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17 so far:
Anodyne (sold)
Super Meat Boy (opened, no foils)
Ion Assault (sold)
Portal 2 (opened, no foils)
Frozen Synapse (opened, no foils)
Saints Row: The Third (sold)
Awesomenauts (sold)
Hitman: Absolution (sold)
Hack, Slash, Loot (sold)
Offspring Fling (sold)
McPixel (sold)
Defense Grid: The Awakening (opened, no foils)
Anodyne (opened, no foils)
XCOM: Enemy Unknown (still to decide)
Counter-Strike: Global Offensive (sold)
Angry Video Game Nerd Adventures (opened, no foils)
Don't Starve (still to decide)
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I open my packs when the price is comparable (~0,1) since there's always a chance for a foil card (but no foils so far)
and all packs till now were opened (some cards sold on market though)
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18 so far:
Anodyne (sold)
Super Meat Boy (opened, no foils)
Ion Assault (sold)
Portal 2 (opened, no foils)
Frozen Synapse (opened, no foils)
Saints Row: The Third (sold)
Awesomenauts (sold)
Hitman: Absolution (sold)
Hack, Slash, Loot (sold)
Offspring Fling (sold)
McPixel (sold)
Defense Grid: The Awakening (opened, no foils)
Anodyne (opened, no foils)
XCOM: Enemy Unknown (still to decide)
Counter-Strike: Global Offensive (sold)
Angry Video Game Nerd Adventures (opened, no foils)
Don't Starve (still to decide)
Paranormal (selling as now)
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All told, since getting out of the Steam Cards beta? About a 10, I think? But I have completed 100+ sets (more sets = more boosters) and I'm level 42 (which is another +80% drop rate).
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2 or 3 I think
I know there's a tf2 and a l4d2 one in there but I don't recall exactly
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gravity badgers, cuthulu saves the world, age of empires 2, fortix 2, dino d-day, magic the gathering 2014, and sequence these are the ones i can remember. so 7 maybe more
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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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