I recently got a Proxmark 3, and used it to read the NFC of the Tamagotchi Friends. This allowed me to get some data on the protocol.
The posters have also been updated to contain a QR code which links to a page on why to avoid each function.
There’s a new Tamagotchi in town, so of course I had to get one (or two or three) and take it apart. The Tamagotchi Friends is the latest Tamagotchi version, which was released two days ago (December 16, 2013). It has similar functionality to previous Tamagotchis, but it also has NFC! The NFC functionality can be used to make Tamagotchis visit and give gifts, and can also be used to “SMS” other Tamagotchis. The Tamagotchi Friends does not have IR or use figures like previous Tamagotchis.
I found a software debug mode in the Tamagotchi code that allows the game state to be viewed and changed in ways that aren’t normally allowed. This mode allowed me to answer more questions about Tamagotchi functionality.Read more