Alien Sky/Walkthrough

Levels
The game contains 10 Missions, each containing at least 12 levels or stages with 1 boss fight, each missions contain different kinds of aliens and alien formations, and with each increasing mission, more powerful aliens will appear which will increase the difficulty of the game, but better weapon grades and power-ups will also start to drop to give the player a better fighting chance, bosses will also become increasingly powerful as the player gets into more advanced missions.