Border Down (ボーダーダウン) is a horizontal scrolling shooter arcade game created by G.rev in 2003. It is a spiritual sequel to Metal Black, a favorite game of creator Hiroyuki Maruyama. As with most other Sega NAOMI titles, the game was later released on the Dreamcast in September 2003 in two incarnations: a normal edition, and a limited edition that came bundled with a music CD and alternative cover art.