Icons encased in square brackets require the respective button(s) to be held down. Hovering the mouse cursor over the Command Input icons will display text that refers to the inputs set in M.U.G.E.N's Key Config. Sonic doesn't seem to have custom A.I., and doesn't make use of Sonic's comboability in its attacks, preferring to make standalone attack approaches. Sonic has 3 standard Hypers, though he can also perform 4 Hypers depending on which Shield the character has on: Shield Burst is a simple short reach knockdown attack Inferno Dash is a flaming dash multi-hit attack Bubble Blitz is an attack where Sonic bounces repeatedly on the opponent Electric Orb is a basic and quick projectile attack Sonic Spinball is an attack where Sonic repeatedly bounces on the screen Blue Tornado is an attack where Sonic spins in the air creating a damaging tornado that sucks far opponents slowly and Super Sonic, the only Hyper that doesn't use 1000 Power (it instead uses 3000 Power), is a powerful attack where Sonic flies back and forth damaging the opponent after going off-screen. Robotnik monitor that takes 50 Life from Sonic, while being unable to kill him a Extra Life monitor that recovers all of Sonic's health, though it is extremely hard to get a Normal Shield that makes Sonic capable of performing Shield Burst a Fire Shield that makes Sonic capable of performing Fire Dash and Inferno Dash a Bubble Shield that makes Sonic capable of performing Bubble Bounce and Bubble Blitz and a Lightning Shield that makes Sonic capable of performing Electric Arch and Electric Orb, as well as occasionally atracting rings, each restoring 10 Life. Sonic will randomly break one of 8 monitors, 4 of them being shields: a 10 rings monitor that restores 75 Life an Invincibility monitor that, while making Sonic invincible, also makes him unable to perform Hypers a Dr. Sonic has an unique Item Box system, where he can break a monitor at any time, assuming the character doesn't have an active shield, by pressing Ⓩ. Sonic is fast and can outrun most characters, having a backwards run as well as air dashes to both directions, while also having all of his Specials move it forward in some way, a trait that makes up for having no projectiles with the exception of Electric Orb.

Sonic is a six-button character, using Ⓐ, Ⓑ, Ⓧ and Ⓨ for his Normals, Ⓒ as a grab button, and Ⓩ to perform Item Box, as well as the only attack button in every Hyper.

Mugen sonic stage