Don't know which ones are working but worth a try:
B8L?W-P87ME-3NGGK ? = R, A, X, Q
C0XKI-KGFZY-E4N4? ? = T, Z, 6, L
BPCEM-MIB?3-JY8D9 ? = 3, O, 7, J
0?TJY-MKT09-D8565 ? = Q, B, X, Z
FCTYJ-WTKV0-LGB?0 ? = R, 6, D, G
9T3?8-85Q87-LG3KX ? = 8, 7, 6, 5
DZMQ3-TZ35A-IFKV? ? = C
24MPF-JBVTG-6X05? ? = 6
0P5YT-RBFGD-2ZW9? ? = I
ETBZ4-5N7X9-VB69? ? = V
85XQC-87TR5-EH3P? ? = W
https://www.humblebundle.com/gift?key=AXHUub??vfbYSpny ?? = 48
https://www.humblebundle.com/gift?key=GHY24XFPcNARyFZ? ? = b
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Keys not taken (And that I happen to already own)
24MPF-JBVTG-6X05? ? = 6 Gun monkeys
85XQC-87TR5-EH3P? ? = W Space Chem
B8L?W-P87ME-3NGGK ? = R, A, X, Q Anomoy War Zone earth
C0XKI-KGFZY-E4N4? ? = T, Z, 6, L same as above
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Critical Mass 0KI?K-?????-G2TM2 (? = ZED)
Fortix 2 0L??P-?????-0F9CY (?? = seven seven)
Hacker Evolution CDBQT-?????-R?HLK (? = nine)
Postal ?XXLV-?????-6MV88 (? = four)
Greed Corp A5S2D-?????-2MHQ5-3YE3?-FCM7B (? = two)
Zombie Shooter 1 07RP?-?????-LX2JR (? = four)
inMomentum 06V0R-BBD?????G-VTZV5 (? = five)
Your Doodles Are Bugged! 07CM?-?????-Q792D (? = four)
Zombie Shooter 2 07DVI-??????-CJTZ6 (? = nine)
Hacker Evolution: Untold 07LLM-?????-KXEA? (? = nine)
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HXL9E-BSNXJ-5RWU4-HHXTU-VLVMD-D9JW8-EH009 30 day eve online for new players
and some dlcs or something for it:
PF2NNZ6MBQ9TQAJ2X79D6EHFF
P33WQX5Z5A4L4QY8LPG6JX8Z4
PCCZM9R4S3PYDSAGQKWU4CXHX
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Future Wars 3V7I8-5E4WV-?FEFM (? = five)
Greed: Black Border 3XZEA-P8LYN-?DCRK (? = nine)
Trapped Dead 3XET0-F0X7Y-?ZBKL (? = eight)
Grotesque Tactics: Evil Heroes 3HDWX-YB?AC-37G6B (? = eight)
Twin Sector 3FMNV-?XJYD-HBM9H (? = six)
Flatout 3J20W-Q?272-4FRQF (? = six)
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Future Wars 3V7K3-BJ??????-TZPQ6 (? = seven)
Greed: Black Border 3XZN?-?????-GMQMD (? = nine)
Trapped Dead 3XH?Y-?????-EPQCY (? = six)
Grotesque Tactics: Evil Heroes 3HG8A-???????-42FG0 (?? = seven eight)
Twin Sector 3FMXF-?????-EA?Y7 (? = six)
Flatout 3J2RE-??????WHKQ7 (?? = seven five)
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Orphan key = A key you're uncertain whether or not got activated (or other platform key like Desura or GOG)
In case you have orphan keys laying around
Drop them here
You might make some lucky bastard happy
Note: Feel free to drop other keys you don't need for other platform like Desura or GOG or anything else.
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