Hidden Moves in Bakugan Dimensions were moves that your opponent couldn't see. At the beginning of a brawl, you and your opponent have two Hidden moves of your Action Bars and are located on the left side of your opponent's Action Bar. You couldn't have more than two Hidden Moves. When a move is hidden, your opponent can't read what its effects are if it's an attack or defense or what power level it is. Whenever a move adds moves to your Action Bar it always tries to go the open instead of Hidden slots. To know that it was a hidden move, it would have a black circle around the edge.
Hidden Attacks will be revealed when you or your opponent plays them.
Hidden Defenses will remain hidden until it has intercepted an Attack or a certain length of time has passed.
Gates will reveal after being played.