Double Jump

The Double Jump is a recurring move in the Sonic the Hedgehog series which first appeared in Sonic the Hedgehog 3. It was first used by Sonic the Hedgehog, but has since been used by several other characters as well. When performing this move, the user does an additional jump in midair.

Description
Double Jump is a special move used after performing a jump. When performing it, the user does an additional jump in midair right after doing a previous jump, without using any solid surface to set off from. In gameplay, this allows the player to get higher into the air and accomplish feats such as grossing gabs too wide for a regular jump or reach higher enemies or areas the player cannot otherwise reach.

Sonic the Hedgehog 3 & Knuckles
The Double Jump first appeared in Sonic the Hedgehog 3, and later its add-on continuation Sonic & Knuckles, as one of Sonic's special moves. In the original Japanese material, it is referred to as the 2 step jump (2段ジャンプ).

To use the Double Jump, the player must have obtained the Lighting Shield for Sonic. Then, to perform it in gameplay, the player must press, or  during a Spin Jump. After setting off with the Double Jump, Sonic will continue to use the Spin Attack which can be used to damage enemies and obstacles. However, should Sonic lose the Lightning Shield, he can no longer Double Jump.

When Sonic is transformed into Hyper Sonic in Sonic the Hedgehog 3 & Knuckles, the player is able to use the Double Jump on their own in addition to the height enhancement. Additionally, Hyper Sonic's Double Jump will automatically trigger an attack dubbed the Hyper Flash which destroys all nearby enemies.

Knuckles' Chaotix
In Knuckles' Chaotix, the Double Jump returned as one of Vector the Crocodile's unique character moves. In the original Japanese material, it is called the double jump (連続ジャンプ), but in the English manual it is not given a name, though its performance is called "to Power Boost." When performing it, Vector does a brief midair dash with his elbow and shoulder in front.

In this game, the Double Jump works differently. Instead of just increasing Vector's jumping height, it lets the player dash in any of the eight basic directions in the game in midair. To perform it in gameplay, the player has to press the C button after doing the Spin Jump while holding the D-pad in the direction they wish to go.

Sonic Blast
In Sonic Blast, the Double Jump can only be performed by Sonic. To perform it in gameplay, the player ahs to press button 1 or 2 during a jump in midair.

Sonic R
In Sonic R, the Double Jump is one of the specific character moves for Sonic and Super Sonic, except Super Sonic can reach much greater heights with his. To use it in gameplay, the player has to press A, C, or Y to jump and then press either of them again for the Double Jump.

Sonic the Hedgehog (2006)
The Double Jump appeared again in Sonic the Hedgehog (2006) where it is only used by Amy Rose. When using it, Amy spins around, similar to the Spin Attack, and does another jump after her first jump. The move's jumping height in this game is greater than average and equals the height of her first jump. To use it in gameplay, the player must press / during a jump.

Sonic Unleashed
The Double Jump appeared again in both versions of Sonic Unleashed where it can only be performed by Sonic the Werehog. In the PlayStation 3/Xbox 360 version, Sonic will spin around and gain more height when using the Double Jump, but in the PlayStation 2/Wii version he does not. To use the Double Jump in gameplay, the player must press the following buttons during a jump:

Sonic Colors
In the Wii version of Sonic Colors, the Double Jump is used only by Sonic in his regular state. After setting off with the Double Jump, Sonic will continue to use the Spin Attack which can be used to damage enemies and obstacles. To use it in gameplay, the player has to press the following buttons during a regular jump:

Sonic Generations
In the console/PC version of Sonic Generations, the Double Jump can only be performed by Classic Sonic. Like in the previous game, after setting off with the Double Jump, Sonic will continue to use the Spin Attack which can be used to damage enemies and obstacles.

Like in Sonic the Hedgehog 3, it is required that the player has obtained the Thunder Shield in order to perform the Double Jump. Once the player loses the Thunder Shield, Sonic can no longer use the Double Jump. To perform it in gameplay, the player has to press / during a Spin Jump.

Sonic Lost World
The Double Jump reappeared in both versions of Sonic Lost World where it is again used by Sonic and Super Sonic when transformed. In the Wii U version however, Sonic does a backflip instead of curling into a ball. To use it in gameplay, the player has to press during a jump.

Sonic Jump and Sonic Jump 2
In Sonic Jump and its sequel Sonic Jump 2, Sonic is able to perform the Double Jump if the player presses the central button (depending on his/her mobile phone model) of the device while Sonic is in mid-air.

Sonic Jump (2012) and Sonic Jump Fever
Every playable character in the 2012 remake of Sonic Jump and Sonic Jump Fever is able to perform the Double Jump by tapping the screen of the device while the character is in mid-air. In Sonic Jump Fever, by collecting the Flame Jump Power-Up, Blaze the Cat can perform multiple Double Jumps in a row for the duration of the Power-Up.

Trivia

 * In the Wii version of Sonic Colors, Sonic could repeatedly perform the Double Jump while in underwater sections of the stages.