According to a notice posted on Japan’s
The notice states:
“amiibo can only store data for one read/write compatible game at a time. If you wish to use the data from other read/write compatible software, please erase the data in the ‘amiibo settings’ section of the Wii U settings menu.”
To sum it up, amiibos only have enough data storage capacity to hold information for one game at a time, although they are able to be used with other games in a “read-only” format. This means that you will still be able to scan the figure in different games, but will only receive limited functionality, such as unlockable items. Take Hyrule Warriors as an example – amiibos will be able to be scanned in a read-only format to unlock randomly chosen weapons, rupees, or materials.