(stylized as SPACƎ INVADERS EXTRƎME) is a re-vamped incarnation of the classic arcade game Space Invaders. The DS and PSP versions were released to mark the 30th anniversary of Space Invaders which saw its original arcade release in 1978. An HD version of the game has been remastered by Backbone Entertainment for Xbox Live Arcade with new four-player multiplayer modes and visualizer backgrounds by Jeff Minter, it was released on May 6, 2009 as a wrap-up to the 30th anniversary. The game is played at a fast pace with an electronic soundtrack and sound effects. A sequel for the DS titled Space Invaders Extreme 2 was released in Japan on 26 March 2009, North America on 20 October 2009, and Europe on 2 October 2009. Space Invaders Extreme was released for Steam in North America on 13 February 2018, to mark the 40th anniversary of Space Invaders. It would later be released on PlayStation 4 and Nintendo Switch as part of Space Invaders Invincible Collection and Space Invaders Forever. Gameplay Single player The player controls a cannon at the bottom of the display (Yellow on DS and PC, Silver on PSP and Purple on Xbox 360) - this can move left or right and fire. To the top of the display formations of invaders appear - these must be shot for points and to avoid them destroying the players' cannon. Sometimes a UFO will traverse the top of the screen. This is the same basic design as Space Invaders; the player loses a life if hit, or if one of the aliens touches the ground (Nagoya Attack); but the formation of the aliens differs greatly, changing from level to level. Sometimes there are only a handful of invaders in a tight formation, sometimes individual invaders advance rapidly down the screen separately from the main formation, and sometimes a boss level will be encountered, often consisting of a very large invader and various guards. The invaders themselves have individual properties, such as firing lasers, splitting into duplicates or charging for the ground after being hit once. Bonuses for higher scores can be obtained by doing as instructed by words that flash up on the background, such as hitting invaders of a particular color or particular type. Shooting four invaders of the same color in a row awards one of four power-ups; bomb, broad shot, laser and shield. If a different set