Why is the puzzle game "Monument Valley" on top of the pay list?

Tencent Science and Technology snow April 9 compiled on April 3 officially on the line after the adventure puzzle game "Monument Valley" (Monument Valley, also known as "The Maze of the Labyrinth") in less than a week on the Apple App Store application Shop application rankings in the first place. In general, video games are difficult to get to the top of the list of Apple App Store apps in a short time, especially for fee games, but Monument Valley has broken the routine. "Monument Valley" was launched by UsTwo, a London studio, for a price of 3.99 dollars. Inspired by the Dutch graphic artist Moritz Conairis Echer (M.c.escher), the game is popular with critics and fans of the game. In today's mobile gaming market, most games use the free mode, through the application of the purchase of the way to achieve profitability, that is, in the application of the provision of powerful tools or weapons. Ken Wong, senior designer at Monument Valley, said he would rather concentrate on designing an interesting game that could be used for a short period of time, rather than designing a game that would require a user to take months to pass. As far as Monument Valley is concerned, most users can pass the clearance within three hours. Ken Wong added that UsTwo was unwilling to adopt a free model for the game and was unwilling to change its design because it wanted to attract a specific audience. Users who have played the game want UsTwo to be able to launch more hurdles, and the studio has said before that the future will eventually be as users wish. However, Dan Gray, the Monument Valley developer, Dan Grey that his team will not be keen on launching more hurdles, because he believes it is now necessary to be strict with himself and not to be caught in the trap of publishing more content to make money. At the same time, users also hope that "Monument Valley" to launch the Android version. The development team said the game was developed using Unity Technologies's coding tool, which means ustwo can easily develop an Android version in a short time and should be available later this month. UsTwo declined to disclose sales figures for Monument Valley, saying it is still collecting the data and plans to publish it shortly. Monument Valley has so far topped the list of fee-based applications in more than 30 countries of Apple's App store.