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Because they face at an angle or lie flat on the ground, the upward-facing moai are best destroyed with missiles. Their weak point is traditionally their open mouth. They are mounted on either side of flat, free-floating platforms and fire a series of colorful rings at the Vic Viper. Moaiįor reasons unknown, the moai statues of Easter Island ( Chile) appear as enemies in several Gradius games. For other types of bosses, like large beasts, the announcer may command the player to "Destroy the eye!" or "Destroy the mouth!", depending on the boss. Additionally, the announcer will normally urge the player to "Destroy the core!" or "Shoot the core!" prior to an encounter. All cores must be targeted in order to defeat a warship, which normally comprises several phases and often uses the terrain to its advantage. Cores are usually blue, glowing masses of energy hidden within large warships and protected by a series of barriers.
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The concept of the "Core" is a central part of Gradius. Weapon Edit, first introduced in Gradius III (For Super Famicom/Super NES), allows players to construct a custom weapon route (the content of the power meter) from the basic categories, such as missile and laser, instead of using one of the predefined weapon routes. Other games using a similar power-up method include Contra Force by Konami, Slap Fight by Toaplan, Rare's Cobra Triangle and Ocean's Wizball. Traditionally, the power-ups with greater effects are placed toward the end of the bar, so that the player must do more work to obtain them, although in some titles like Gradius III a harmful power-up exists at the end which will restore the default (weak) weapon configuration. The player may now activate this to receive a missile weapon, again causing the bar to revert to its unhighlighted state, or choose to hold out for the next item, a double gun. Gradius power meter with second power-up highlighted
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