Gradius NEO Imperial is a horizontally-scrolling shooter game developed and published by Konami in March 1, 2004 for mobile phones, and was released on NTT DoCoMo's FOMA 900i line of phones in Japan.
In contrast to other Gradius games, players control the opposing force in form of a Big Core. However, since the Big Core that the player takes control in this game is a betrayer ship escaping from the Lars Empire, which is the enemy in Gradius NEO, playrs won't fight against the Gradius Union.
The Gradius NEO series appears as the Sequel of the last Nemesis game, Nemesis 3.