Contra Advance: The Alien Wars EX is a run-and-gun action game released by Konami for the Game Boy Advance (GBA). It acts as a modified port of the SNES classic 'Contra III: The Alien Wars.' Players control elite soldiers Bill Rizer and Lance Bean to stop an alien invasion. While retaining the side-scrolling intensity of the original, this version replaces the top-down stages with levels from the Sega Genesis title 'Contra: Hard Corps.' Known for its high difficulty and fast-paced shooting action, it features a variety of weapons like the Spread Gun and Laser, challenging players to save the Earth from the alien menace.