This is a clear tumbler from Gameworks. Usually items like this are glass, but this one is heavy clear plastic instead. See the thick bottom? There's a cool Sonic graphic hidden within the plastic. Notice how you don't see it in the first photo, but then, as you change the angle, it is revealed! When there's liquid added, it can create Sonic illusions/ghost images on the sides due to the reflections. *Also note that the logo on the side of the cup is unique to Gameworks. (The arched/ring shape, pose for Sonic & logo placement) so you can tell Gameworks win-able stuff apart from other items. This is trade-for-able at the ticket counter in Gameworks in the USA in 2011. This looks like a really worth-while item to aim for, with its cool hidden feature!