Wave Command Codes or Wave Command Cards (Blank Cards), are codes introduced in MegaMan Star Force 2. These codes are obtained from Wave Command Cards, that are sold separate from the game itself and obtained from different parts of the game such as sidequests on Blue Mystery Wave.
To input a Wave Command Code, the player has to press Select from the Mega submenu, or whilst highlighting a Blank Card in the Battle Card inventory. Then, the player has to place the Wave Command card over the touch screen, and touch the portions of the screen in the correct order, thereby inputting the code and providing the player with the Battle Card or bonuses from the code.
Wave Command Codes are capable of changing Blank Cards into different secret cards; however, only one copy of a Wave Command-altered card is allowed. In addition to this, they can spawn items and Zenny for the player, and even provide the player with abilities and boosts, ranging from HP increase to an ability to start off in a certain Tribe. They can also modify encountered enemies, turning some viruses giant, or changing SP bosses to DX forms. Some bonus shops are also made available to the player if a certain Wave Command Code is entered to a certain NPC.