Nintendo released today the DEMO version of the Mario & Sonic at the Rio 2016 Olympic Games in Japan. The final version available a long time ago in Japan it is very popular since the release of the game. You can buy it on Nintendo 3DS and Nintendo Wii U just like in other regions.
Nintendo today on August 3, 2016 released the official DEMO version on both platforms and you can download them for free from the Japan eShop. In the Wii U version demo you can try the 100m running, Rugby Sevens and the table tennis (single player).
The Nintendo 3DS version includes the soccer, rhythmic gymnastics hoop, 100m running and an extra soccer content.
You can’t move the save data file into the final version of the game but still worth to download it if you are interested in the full version.