Desura (Keys)?!

I found some Desura Keys which I do not need so here they are:

Terra Incognita: The Descendant - Groupees Special Edition
HMVDV-G2LMN-ZO4R)-J7H6J-J04WW (): |x²| =64)

Chaos Ride
KNA)G-NEN28-1WR6E-N8CYW-6GVN0 (): |x^4| = 81)

Zigfrak
GRPD-Q)QV-B5ZE (): |x^4| = 225)

The math tasks should not be so difficult! Please let the others know if you got the key!

Have fun and good luck! :D