Drink up a mug full of nostalgia with this Nintendo Game Boy Heat Change Mug. The mug features the design of the classic Game Boy, but that’s not it…. just fill it up with hot liquid and watch the screen turn from black into a game of Super Mario Land! In fact, it has two ‘screens’, one with the start menu of the game, and the second has a classic Mario moment, seconds before Daisy turns into a jumping spider. This is an officially licensed Nintendo merch.