Developers of non-"Tekken" games have commented on the series in various ways. Ed Boon, the co-creator of "Mortal Kombat", revealed in one of his interviews with GamePro that his favorite fighting game out of his competitors is "Tekken". Both Sega and Namco have shown interest in a possible crossover between "Virtua Fighter" and "Tekken", which came in the form of "Project X Zone" and its sequel for the 3DS. The series has often been labelled as a "rival" to "Virtua Fighter" as the two became the most famous 3D fighting game series. On the other hand, Tomonobu Itagaki, designer of the "Dead or Alive" series, expressed dislike for the "Tekken" franchise to the point of placing it as one of his most hated games.