Sylphia is set in a classical Greek setting, during a time when gods and humans coexisted. Hades, god of the underworld, falls under the influence of monsters once defeated by the gods on account of a mysterious mask, and begins sending those monsters out to ransack and dominate the land above, forcing the gods to retreat to
Mount Olympus. The young maiden warrior is reincarnated as a demigoddess under
Zeus after her demise in battle, tasked with destroying the monstrous armies and putting an end to Hades' madness. She is given wings similar to a
dragonfly, allowing her to fly. The player controls Silphia through eight stages featuring a constantly scrolling background populated with enemy forces and obstacles. The scenery never stops moving until a boss is reached, which must be defeated to progress. Each stage includes a
mid-boss and an
end boss. She can also obtain four different special weapons based on the four
classical elements, which affect her shooting method. These can be upgraded by collecting the same weapon currently in use or by collecting power-ups. Silphia can also execute a powerful lightning beam attack, but it must be charged by collecting crystals after being unleashed. Getting hit by enemy fire or colliding with solid stage obstacles decreases Silphia's health. A
game is over once her health is depleted, though the player has the option to
continue, which decreases Silphia's firepower to its original state. == Development and release ==