Producing more quality social games will be a key to succeeding in the growing smartphone video game market as devices become more powerful and high-speed networks spread, according to Yoshikazu Tanaka, the president of game site operator Gree Inc.

Tanaka made the comments in a speech Thursday to help kick off the Tokyo Game Show at Makuhari Messe in Chiba, the industry's top event.

"There will be smartphones that are more capable than computers," Tanaka predicted. "The question is, what kinds of games can we provide to users?"