Why Gwent: The Witcher Card Game and Shadowverse are similar

Type of card game that mixes strategic deck building elements with features of trading cards, introduced with Magic: The Gathering in 1993. Generally a player may begin playing a CCG with a pre-made starter deck, and then customize their deck with a random assortment of cards acquired through booster packs, or from trading with other players, building up their own library of cards. Wikipedia

Cross-platform game engine developed by Unity Technologies, first announced and released in June 2005 at Apple Inc.'s Worldwide Developers Conference as a Mac OS X-exclusive game engine. , the engine had been extended to support more than 25 platforms. Wikipedia

Mobile operating system based on a modified version of the Linux kernel and other open source software, designed primarily for touchscreen mobile devices such as smartphones and tablets. Developed by a consortium of developers known as the Open Handset Alliance and commercially sponsored by Google. Wikipedia

Group of several proprietary graphical operating system families, all of which are developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. Wikipedia