Please, don't ban me!

Because I accidentally made this ;)

_ = some digit,
+, @, % and ? are some letters,
So you need four letters and one digit. Thank you, your Captain Obvious. ;P
If (+) is something in one key, then it's the same in all of the other ones.

The only hint is... 'The best place to hide something is right in front of you.' ;)

To those, who failed to find the answer - Letters are the first ones in games' names, excluding F and M (but you could've checked it, because there are F and M letters in keys) and digit is... 2 (Fortix 2) ;)

Critical Mass,
(+)XD85-A(@)6V3-P(?)D(@)K (GONE)
(+)X(?)J(%)-(+)DNJ6-I(@)YI6 (GONE)
(+)X(?)A(@)-43AX(?)-AA(_)A9 (GONE)

Fortix 2,
I()G64-3VP(@)D-VL()AL (GONE)
I()F()A-(@)ZX5(@)-LIYL(@) (GONE)
I(_)F05-Q(+)RRV-7F5A7 (GONE)

Bunch of Heroes,
(+)X(%)GQ-77(+)M(%)-3R9A9 (GONE)
(+)XD0R-KXMR(@)-V(?)3E9 (GONE)
(+)X(?)8Q-V8(+)4(_)-MWT(+)J (GONE)

Hacker Evolution,
AJ90D-LVNR(_)-VDQ(%)5 (GONE),
AJ5AG-JFDTP-VI(+) 9(+) (GONE),
AJ3PR-(%)LMM7-80(?)WL (GONE)

Bonus:

Not sure if those are still not activated:

Critical Mass:
HVE2V-ENM58-R0MVK
HVDCG-JKN09-H9VK4

Fortix 2:
HZ5VP-TBFL0-NC0YA
HZ8B8-2E2EQ-47RKI

Bunch of Heroes:
HTZ88-QMJG2-GHGQ6
HTYFW-HIX90-6YPVX

Hacker Evolution:
AG7DI-M429F-DFX8A
AG6FB-7ZHLP-T06A0