3D Dotty is a video game published by Blue Ribbon for the Acorn Electron and BBC Micro home computers in 1987. The aim is to clear the dots on the three levels of each screen while avoiding the dreaded fungus. Any contact with the fungus will reduce energy, and a life is lost when the energy reaches zero. The fungus can be blocked, but only three blocks are permitted at any one time. On completing a screen a bonus is added to the score, proportional to the amount of energy remaining. Source: Wikipedia, "3D Dotty," available under the CC-BY-SA License.