Game Boy line
When Nintendo released the Nintendo DS handheld in 2004, they said it was a "third pillar" (the other two pillars were the Game Boy and the home console). It has two screens, one of which is a touch screen. DS games use cards in Slot 1. Slot 2 can accept Game Boy Advance games. A newer model, called the DS Lite, released in 2006, also plays GBA games. But like the GBA Micro, neither of them can play original Game Boy or Game Boy Color games. The DSi and DSi XL, released in 2008 and 2009, replaced the GBA slot with an SD Card. This makes it impossible to play GBA games. Some DS games also included extra features contained in "option paks", which were just like GBA games. So these features could not be used on those DS games if they were played on the DSi or DSi XL.