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One bonus credit is awarded for completing each of the first three levels after the fourth is completed, the player receives a large bonus depending on the number of unused credits. One life is lost whenever the player's ship collides with a target or is hit by enemy fire.Īt the beginning of the game, the player is given a set number of credits that can be used to continue play if all lives are lost. In addition, at the end of each area, the player receives bonus points depending on the percentage of primary targets and enemy craft destroyed. Points are scored for destroying enemies and collecting bonus coins and fruits. The player can collect power-ups that affect the type and firing rate of the ship's weapons, equip auxiliary cannons, or double the point values of all enemies and items.
The game consists of four levels, with five areas per level and a strong boss enemy that must be defeated at the end of the fifth area. The player flies an antiquated spacecraft (the last of the fictional F-27 Platypus fleet) and attempts to defend the peaceful country of Mungola from neighboring Colossatropolis, which has become so overcrowded that its inhabitants are taking over Mungola for space and resources.
