The mid-core gamer enjoys games but may not finish every game they buy, doesn't have time for long MMO quests,[23] and is a target consumer.[24] Nintendo president Satoru Iwata stated that they designed the Wii U to cater to core gamers who are in between the casual and hardcore categories.[25] A number of theories have been presented regarding the rise in popularity of mid-core games. James Hursthouse, the founder of Roadhouse Interactive, credits the evolution of devices towards tablets and touch-screen interfaces, whereas Jon Radoff of Disruptor Beam compares the emergence of mid-core games to similar increases in media sophistication that have occurred in media such as television.[26] Hardcore gamer: Ernest Adams and Scott Kim have proposed classification metrics to distinguish "hardcore gamers" from casual gamers,[27] emphasizing action, competition, complexity, gaming communities, and staying abreast of developments in hardware and software. Others have attempted to draw the distinction based primarily on which platforms a gamer prefers,[28] or to decry the entire concept of delineating casual from hardcore as divisive and vague.[29]