The Rumble Pak for the Nintendo DS is an official DS Option Pak shaped like a Game Boy Advance cartridge and is designed to be inserted in the system's Game Boy Advance game slot (SLOT-2). It is the first Nintendo DS accessory to have utilized the slot. In North America, it was first made available bundled with "Metroid Prime Pinball", but was later sold through other promotions or as a stand-alone purchase from Nintendo's online store. The accessory was released differently in Europe due to a delay of "Metroid Prime Pinball" in that region. Various DS games supporting the Rumble Pak ("Metroid Prime Hunters", "Mario & Luigi: Partners in Time", and "42 All-Time Classics") had been released in Europe before the accessory was available. The accessory was eventually released as a pack-in with the game "Actionloop" in the UK.