When performing the Big Air, the user performs an acrobatic maneuver in midair that lets them spring upward to gain extra height. How this acrobatic maneuver is executed depends on the user.
In gameplay, this move is useful for reaching areas above that are otherwise difficult to get to and avoiding falling into gaps. In addition, it will not cancel the momentum the player receives from the Boost Mode. Big Air cannot normally damage enemies though, and using it leaves the player open to harm. Depending on the user, the Big Air may have other traits to it. However, the Big Air can only be pulled off after the user has been launched into midair by gimmicks like the Spring or Ramp.
Sonic Advance 2
The Big Air maneuvers first appeared in Sonic Advance 2 alongside the other Mid-Air Trick Actions. In this game, the move can be pulled off by any playable character except for Super Sonic. To perform the Big Air in gameplay, the player must press up on and the R Button at the same time after being launched into midair by gimmicks.
Sonic Advance 3
In Sonic Advance 3, the Big Air maneuvers can be pulled off by any playable character except Knuckles the Echidna and Super Sonic. Due to the game's partner system however, the Big Air can only be used by the characters when they are paired up correctly. As such, Sonic must be paired up with Tails, and Amy must be paired up with Cream (or vice versa), in order for any of these characters to use the Big Air.
Like in Sonic Advance 2, for the player to use the Big Air in gameplay, press up on and the R Button at the same time after being launched into midair by gimmicks.
Sonic Rush series
In Sonic Rush, the Big Air maneuvers are a part of Sonic and Blaze's standard Trick Actions. While using them grant points, they do not fill the Tension Gauge. Additionally, these maneuvers can be executed while using the Fire Boost/Super Boost. To use the Big Air in gameplay, the player has to press up on and at the same time after being launched into midair by gimmicks.
Sonic Rush Adventure
In Sonic Rush Adventure, the Big Air maneuvers can again only be pulled off by Sonic and Blaze. They also possess the same traits they had in Sonic Rush. Like in Sonic Rush, to use the Big Air in gameplay, the player has to press up on and at the same time after being launched into midair by gimmicks.