Game On Halfpipe Winter Lager

This 5.75% ABV beer is from the Game On Brewing Company of Glendale, Wisconsin.  It seems odd in this day and age that I don't find a website for them. They have a line of sports-themed beers.  This may be an offshoot of the Sprecher brewers (who also do Chameleon beers). 

The beer pours a very dark brown, mahogany, appearing almost black, some garnet when held to the light. There is a short head of creamy light brown foam. The aroma is malty, as much sweet potato as dark roast, with a bit of metallic, mineral tang. The taste follows the aromas. For its dark color, it tastes more Oktoberfest malty than the dark roasts expected. There is a tang on the finish. It is medium-bodied and smooth in the mouth.