If aforementioned games used “time” as an element that distinguishes itself from others, <1979 Revolution: Black Friday> shows that “time” can also be used as the theme of the game. The player plays the game only by taking pictures in a historical event, and the pictures taken at this time are compared with real pictures containing real historical events. The player gets pieces of “historical time” through the game and learns about the history of that time period. As such, “space” and “time” are used in various ways in the game, and are important components that can be used. With just one element of “space” and “time,” the game can have an infinite potential to be expressed. Therefore, thinking about how to configure “space” and use “time” will be a solid foundation for a good game making process.