Pepsi Ghost Mystery Flavor/ペプシゴースト・ミステリーフレーバー

Japan is known for their seasonal flavors.  Pepsi had a Halloween Special called 'Pepsi Ghost'.  You get a mystery flavor drink.  Recently, I went to Osaka on December 28 and saw a vending machine were most of the drinks were 50yen, which is roughly around 50cent.  They had the Halloween Special soda!
最近、大阪に行きました。50円の販売機を見ていました。そして、ハロウィーンの飲み物もあります。

I thought it would be a new flavor, but the flavor was Dr. Pepper.  I guess it is a mystery flavor and the chooses are from original flavors.
ミステリーフレーバーは新しい味だと思いますが、味はドクターペッパーでした。