Blackhole is a classical 2D platformer. Player's task is to collect Selfburns. He has to collect at least one in every level to complete it. If he collects all Selfburns in the level his time is saved. Player can try to get a better time in each level if he collects all selfburns. Even though player need only one selfburn in every level, he also has to reach a certain number of collected Selfburns to finish the game. Source: Wikipedia, "[en.wikipedia.org/wiki/Blackhole_%28video_game%29 Blackhole (video game)]", available under the CC-BY-SA License.