Pang (or Buster Bros.) was a popular 1989 arcade game that was subsequently ported to a number of home computer platforms. The basic gameplay has already spawned a number of App Store clones including Chippy [$1.99], Buster Boy [$0.99], LaserBug [$1.99], Bubble Pang Free [Free].
Player X, however, has brought an official Pang port to the iPhone with Pang Mobile [$2.99]. The gameplay is rather simple by today's standards, and also pretty unforgiving. The game involves popping balloons bouncing on the screen with one of several possible weapons. The standard weapon is a harpoon that fires upward. If a balloon contacts the harpoon, it splits into smaller pieces. This repeats until your eliminate all the bouncing balloons. Smaller balloons, however, bounce at lower heights, making them harder to hit. Power-ups allow for a double shot, machine gun, and shield, while in-level obstacles can help or hurt your chances.