Ikaruga is a vertically scrolling shoot 'em up video game developed by Treasure and released in 2001. Players control a spacecraft that can switch between two polarities: black and white. This unique mechanic allows players to absorb enemy bullets of the same color while taking damage from the opposite color, adding a strategic layer to gameplay. The game features a series of challenging levels filled with enemy ships and intricate patterns of bullets. Players can also collect power-ups to enhance their weapons and score points. Ikaruga is praised for its innovative design and has gained a dedicated fanbase over the years.