The Doctor in digital form

Nintendo's amazing success story continues with the news that its Brain Training series has topped sales charts in two key European territories.

Nintendo's DS Brain Training games have topped the charts in both Spain and Germany.

Dr. Kawashima's Brain Training is at number one in Spain, with sequel More Brain Training taking the coveted spot in Germany.

Neither the Spanish or German top ten has any PlayStation 3 or Xbox 360 games, with Wii, PlayStation 2 and DS the dominant formats.

Who would have thought such a simple game could generate so much cash? Dr. Kawashima FTW!