Some keys I have not used.
Rush Bros. 2JNIN-4GFPH-ZATRD
PID 0Q88E-ZTRG6-P2AVI
Magicka https://www.humblebundle.com/gift?key=cWEcUbtATWBrwmHv
Groky 17 GT5YK-0VP9G-888BR
Naval War HF7WX-BCWNZ-E7CAR
Showdown Effect GTC5I-0WJVW-7I54F
Also for people who don't know you can get PID free...