Bust-a-Move Ghost Unlockables (PSP)

Bust-a-Move is an arcade puzzle game series created by Taito and contains elements of Sega's Columns and Atari's Breakout. At the top of the rectangular playing arena, a number of balls (intended to be bubbles) of various colors are placed in a prearranged pattern at the start of the level. At the bottom of the screen, the player controls the angle of a fixed cannon that fires semi-randomly colored balls in a straight line. The ball, when fired, travels in straight lines, possibly bouncing off the side walls of the arena, before eventually coming to rest either touching one or more of the balls, or at the top of the arena. If the ball manages to come into contact with identically colored-balls, thus forming a group of three or more, those balls, and any balls hanging only from them, are removed from the field of play, and points are awarded depending on how many balls are removed from the screen at once.

Unlockables

Unlock Character
Choose VS CPU mode. Then choose VS Classic puzzle mode. Beat the game on this mode to unlock the character.

Unlock Character
Choose VS CPU mode. Then choose VS Ghost Puzzle. Beat the game on this mode to unlock the character.

Unlock Level 2 Drop patterns
In VS CPU Mode, select vs Blind mode. Beat VS Blind Mode to unlock a level 2 drop pattern for specific characters.

Unlockable Character: Maggie
Upon finishing all 300 levels in Classic Mode, You can unlock the new character Maggie.

Unlockable character: Zaulen
Character Zaulen is unlocked by finishing all 300 levels in single player Ghost Mode

Here's how the game used to look like before we had PSP consoles: