The Balloon Gun (バルンガン) is an enemy that appears exclusively in Tails' Skypatrol.
Balloon Guns are projectile-firing cannons that are held aloft by balloons. Destroying the gun half will release the balloon which can then be latched onto by the player, and popping the balloon half will send the gun half plummeting to the ground. They are worth 500 points upon being destroyed; projectiles are worth 100 points a piece.
This is the most common type of enemy in the game, as it appears in every level that has enemies in it (this excludes the Training Area).