Pig Bang 1-20 is the 20th level of Pig Bang.
Pig Bang level 1-20 is the introduction of the Lazer Bird.
The level is easy, but it is worthwhile to play it a few times to get the hang of this new ability.
Launch the Lazer Bird to the left of the planet, then tap/click the screen on the far-right pig. You will see purple crosshairs appear where you tapped, and the Lazer Bird will turn in a straight line toward it.
It's hiding in the bush on the north of the planet. Use Lazer Bird to get it.