As with most games covered on this wiki, Chaos Code uses numeric notation. If you aren't sure what means what, look at the number pad on your keyboard.
For instance, 5 is neutral, 2 is crouching, and 236 is a quarter circle forward ("hadouken") motion.
Dash/Run - 66 or 44
Depending on your selection, pressing forward twice will move your character forward in either a dashing state or a running state. A dash is a relatively short hop that moves the character forward with a bit of invincibility, while a run allows you to hold forward and continue moving the character. Some characters have special properties on their runs.
Jump - 7, 8, or 9
Pressing up or diagonally upwards makes the character jump. Character jump speed and distance are not standard.
High Jump - 1, 2 or 3 then 7, 8 or 9
A higher than normal jump.
Double Jump - 7, 8 or 9 after a normal jump
Pressing up or diagonally upwards again while already in the air propels your character again in a double jump. Unlike many fighters, you CAN air dash after a high jump.
Air Dash - 4 or 6 in the air.
While in the air, press forward or backward twice to air dash in that direction. Air dashes in this game generally are not as long or have as much velocity as those in most games with them. You cannot air dash after a double jump.
A+B - Roll
Both weak buttons will cause your character to slide forward for a bit. If you've ever played any of the numerous SNK fighters with rolls, they function pretty much the same way here. You are temporarily invincible to all but throws while rolling, but can be punished on recovery if you aren't careful.
A+B when recovering - Tech
When knocked down, press both weak attacks to get back up. You can tech both ground and air hits, but you can only tech straight to a neutral position, there is no forward/backward roll.
Chaos Code has four attack buttons, two punches and two kicks. The game features the magic series which allows you to chain A->B->C->D including any crouch versions. In general, A and B normals are cancelable along with close C and D normals. Far C and D normals are sometimes cancelable, but it depends on your character.
A+C - Throw
By pressing both punch buttons, you can perform a throw on your opponent. Naturally, this is unblockable. The C button is used to tech throws.
6+C+D - Guard break
At the cost of a single bar of meter, you can instantly crush your opponent's guard.
C+D - Tactical Guard
If you see an opponent's attack coming, press both kicks to repel it and get a free counter hit. Can also be done in the air. This does not work on projectiles.
A+B or 6+A+B - Chaos Shift
A cancel that can be achieved during your super. A+B puts your in a neutral position, and holding forward lunges your character. A good mechanic for combo extension or to protect yourself if something goes wrong.
Most special moves in Chaos Code have an EX version that can be performed for 1/2 a bar of meter. You can cancel to special moves including EX specials off most normals or command normals. For instance, your chain may look something like 5A, 5B, 5C, 6+C, 236+C.
Super moves, or Ultimate Chaos attacks as the game calls them, are performed at the cost of a single bar of meter. You can cancel supers out of most special or normal moves at the cost of an extra bar of meter, in exchange damage scaling on the super gets reset.
At the cost of 3 bars of meter, each character can perform a very powerful super move. The properties and damage of each move depend entirely on the character.
When selecting your character, you are presented with four attacks, two special and two Ultimate Chaos attacks, not found on the character's standard move list. You choose two of these moves to add to your arsenal. Which moves you choose can drastically effect your character's playing style, so consider your options wisely.
B+C - Exceed Chaos
At the cost of three stocks of super, you can perform a small "burst" that pushes opponents away and enter an enhanced mode that allows access to combos that are not normally possible. Additionally, you will be able to use super meter infinitely without restrictions, and will gain health passively. However, when the time runs out you will lose access to your meter temporarily. Exceed Chaos can be cancelled into from many normal, special and super attacks.
Beneath the character's life bar is a purple meter that fills while the character is being attacked or comboed. When it fills, the character is knocked down and recovers in a dizzy state, totally helpless to anything their opponent may want to do to them. While not under attack, the meter passively refills.