Upvote:2
If your visa is valid for SCHENGENER STAATEN
, then it is valid for travel anywhere in the Schengen zone (within its period of validity, allowed length of stay and number of entries). You do not have to enter the Schengen area through Germany.
One caveat, however: If it is the first trip you use the visa for, the purpose of travel you described in your visa application must still apply to the trip you're actually making. You can add "side quests" to other Schengen countries at will -- but if you abandon the original premise of the trip and you're found out at the entry interview or later, you risk the visa being cancelled (or annulled, if they think you never had any intention of following it, which is even worse). This holds especially if your trip changes so much that Germany is no longer its main destination.