The objective of the video game Doodle Jump is to prevent the character known as "The Doodler," a critter with four legs, from falling off of an endless sequence of platforms. The edge of the playing field on the left curves around to meet the edge on the right.
Doodle Jump also has a more polished appearance and enhanced visuals than its predecessor. I mean, they're still doodle pictures, but there's a definite boost up in clarity and animation quality this time around, and for a game that has such a simplistic appearance, those tiny things go a long way. I'm not saying that they're not still doodle graphics, though.
In the game Doodle Jump, the black hole serves as a perilous obstacle. They give the appearance of a circular tear in the paper that is a dark color. It assumes a different look based on the setting, such as an actual black hole when the scene is set in space. Should the Doodler come into contact with the black hole, it is likely that it will be sucked in.