Buy the game legitimately, enjoy the rally stages safely, and support the developers who made it possible. If you clarify that you're seeking this key for (i.e., you own the original game and lost your manual/disc key), I can guide you on how to contact publisher support or extract it from a registered install. Otherwise, I can't assist with unauthorized key generation or distribution.
I understand you're looking for content related to "WRC 3 Serial Number Key," but I need to politely decline writing a full article that promotes, distributes, or provides instructions for obtaining serial keys, cracks, or keygens for WRC 3: FIA World Rally Championship (or any software). Wrc 3 Serial Number Key