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Description
In the beginning of a game, player's fighter is AXION 001. A fighter can gain levels by buzzing of destroying enemy units or buzzing. Once the fighter gains sufficient level, it changes form and its firing patterns are altered. Fighter's level is maintained between stages, lives, and credits.
Each time an enemy unit or bullet gets very close to player's fighter without destroying player's fighter, a "buzz" occurs. For each buzz, the fighter gains experience (indicated by meter at the top of the screen). When the fighter gains sufficient experience, its level increases, and it becomes temporarily invulnerable. During that period, fighter can inflict damages to enemy units by colliding. Player can use this short period to risk buzzing more bullets to quickly reach the next level, or to avoid particularly difficult bullet patterns. The collision area for trigger buzz to occur is a circular area surrounding fighter's hit box, covering the fighter's body.
When buzzing causes the fighter to transform, the damage to nearby enemy units increase. If a fighter is rolling, the buzz radius increases, fighter's hit box is reduced, and the buzz collision detection is only done once every 2 frames.
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