Square Enix, one of Japan's leading video games publishers, is hunting a partner in the US and Europe to help raise overseas sales to 50 per cent of overall revenues within three years.
"We need to seek co-operation with a US publisher – we need local content," Mr Sasaki said at the Tokyo Game Show. "Our strength is in role-playing games and fantasy titles, so it is a bit difficult to appeal to the US market."
Mr Sasaki credited Nintendo with helping expand the $30bn global games industry by creating a new "casual gaming" audience of women, children and older people.
Square Enix was a "little worried" about the lackluster performance of Sony's PlayStation 3 console, he said.