This is true, especially for weekend games, but I checked and main doors will not open until 730pm. Since its a national tv game everyone has to be wanded, lines will be long at main doors. You are better off entering through the bud light courtyard, as stated before it will open at 630pm.
When you get into the courtyard look for the guy with the mic, he gives out free merchandise, seat upgrades, and also selects people to go on the court during player introductions. Tell him you are from germany and he might hook you up with something. If he isnt in the courtyard due to the weather you can probably find him in the headlines bar area, and he usually gives out stuff for atleast 30 mins or so