Robo Burner (ロボバーナー, Robo Burner) is R.O.B.'s up special move. The move is a very effective recovery move. Although it deals no damage, it can be used, then deactivated for an attack, then reactivated, making it extremely useful for edge guarding. Robo Burner relies on fuel, which automatically charges when R.O.B. is touching the ground, taking about 1.5 seconds to fully charge.
Robo Burner can propel R.O.B. great distances, both vertically and horizontally, making it, arguably, one of the best recovery moves in the game. However, since it is unable to charge when in the air, aggressive edge guarding on the opponent's part can prevent R.O.B. from safely returning, by simply forcing R.O.B. away from safety until his fuel runs out. An effective way to overcome this strategy is by floating considerably beneath the platform, making edge guarding either difficult or suicidal, then jetting upwards and grabbing onto the ledge.
Unlike most up special moves, Robo Burner does not put R.O.B. into a helpless state after he uses it, and R.O.B. can perform any aerial attack or use the move again (with remaining fuel) after using Robo Burner. In addition, after using an aerial attack, he can use Robo Burner, use any other special, use any aerial attack, fastfall, or air dodge.
Its effect can be maximized by rapidly pressing the special move button or up instead of holding it; using this method will almost double the distance gained, due to the maintained inertia of the move. This makes it arguably the second longest recovery move in the game behind Villager's Balloon Trip, not counting Gliding or Peach's two floating abilities.
As a side note, some R.O.B. Blaster enemies in the Subspace Emissary have the ability to use Robo Burner for an unlimited amount of time, allowing them to chase fighters down and constantly fire Robo Beams at them.
In Super Smash Bros. Ultimate, a gauge has been added to R.O.B.'s chassis, displaying the amount of fuel remaining for the move.
Special Move customization was added in Super Smash Bros. 4. These are the variations:
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