Sky Adventure is a up-scrolling shoot 'em up game. The jungles are invaded by the Underground Organization led by the insane Colonel Claud and its up to the opposing strike force to end his madness. Before starting a stage, the player chooses one of four planes each with their own speed, firepower and defense capabilities. Firepower upgrades increase the spread of your projectiles and energy collectibles fill the energy needed to power your defense ability. There are also collectibles that switch your plane type. There are five stages in the game. In each stage, the player fights against waves of enemies, a mid-boss and a end stage boss. Destroying enemies and projectiles earns the player points. If a mid-boss is destroyed without the player getting hit, bonus points are awarded depending on how quickly the mid-boss is destroyed. At the end of each stage, the overall points. If the player acquired enough points, prizes are awarded.