RGB 2 description:

RGB 2 - Red, Green, Blue is the toughest most skillfull shooter you will ever play, shoot the targets to the music using the correct colour ammo for each target. Each shot landed increases your combo multiplier. Achieve the colour combo at the bottom for an additional bonus.

game instructions:

You have to shoot the targets with the right colour ammo. Select ammo by pressing 1 = red 2 = green 3 = blue