Nintendo preservationist Forest of Illusion recently shared information gleaned from an old prototype of the firmware for the Nintendo DS. These types of discoveries are often interesting, as they can give fans an idea about decisions that were made before a piece of hardware came to market. In this case, Forest of Illusion discovered that the DS nearly included a request for the user to list their blood type, alongside normal questions like sex and birthday! That inclusion probably would have raised eyebrows among a lot of users, which is likely why Nintendo ended up dropping it before the system’s release.

We’ve preserved another prototype of the Nintendo DS firmware! This one is ver 0.40615, and is much earlier than the one we released a few months back, missing various settings. Something fun to note is that there are blood type selection settings which never appeared in retail! pic.twitter.com/CdOxUVZmXx