Nintendo president Satoru Iwata has expressed concerns over Mario game sales in the UK. Speaking to investors and highlighting the UK top 20 software chart to the right, he said: "Although there are six titles for the Nintendo platforms, the two Mario titles for the Nintendo 3DS have the smallest presence in the world. We need to promptly improve this situation."We don't think Iwata means Mario games are selling more copies in European microstates like Andorra and San Marino than they are in the UK, but rather that their UK performance is relatively poor when compared to sales in other major gaming nations like the US, Japan, Italy, France, Spain and Germany. Iwata presented top 20 lists for these countries too, in which Mario games charted more frequently or in higher positions. The Xbox 360 version of Mass Effect 3 was the top-selling game in the US and the UK during the first three months of the year, while One Piece Pirate Warriors for PS3 was the No.1 game in Japan during the first 16 weeks of 2012.