There exists a total of seven Custom Actions in Sonic the Hedgehog (2006), all which can be used exclusively by Sonic. Each Custom Action grants Sonic a unique ability that the player can use to leverage the gameplay. The player can obtain a Custom Action by purchasing the appropriate Gem from a Shop in the Town Stages in Sonic's storyline of the game. After being purchased, the player can select a Custom Action to use by using the D-pad, which will set the Gem with the desired Custom Action next to the Action Gauge. They can then use it by holding or pressing /, depending on the Action.
List of Custom Actions
|Gun Drive||Sky Gem||Allows Sonic to throw an emerald and then quickly dash ahead and catch it.|
|Homing Smash||White Gem||Allows Sonic to stop in midair and perform a charged Homing Attack.|
|Mach Speed||Blue Gem||Initiates an increased Speed Boost.|
|Scale||Purple Gem||Shrinks Sonic to a miniscule size, making him harder to hit and allowing him to jump infinitely.|
|Slow||Red Gem||Slows down time when the Action Button is held down.|
|Thunder Guard||Yellow Gem||Creates a Magnetic Shield.|
|Tornado||Green Gem||Creates a small whirlwind that deals damage to surroundings.|
- The Action Gauge was originally intended to limit Sonic's usage of these gems, but since it was never coded correctly, it never runs out.