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deanhills, you need DDoS protection that works on different layers and protocols. For game servers UDP DDoS protection is very important because UDP is the most common used protocol for realtime applications like VoIP, game servers and IPTV.
UDP however is a bit special so not every DDoS protection provider offers UDP DDoS protection. What most providers without UDP protection do is simply nullroute the IP address and that literally has the effect of a normal downtime because the IP and all services under it cannot be accessed. So that is not even remotely a protection. They just do it to prevent the attack from spreading across their network and disturbing their network.
OVH for example has their special game DDoS protection products/addons which are basically basic/advanced UDP filtering DDoS protection through their firewalls and network infrastructure.