Interest in relational N-Back tools – Are they still available?

[Bautista Moreno]

Hello, some time ago I saw that someone had dedicated themselves to making some websites for training in various forms of n back, such as tri relational, dual relational spatial, and relational voice. I found it very interesting since it contributed a lot and seemed to be a very useful training. Today when I returned to my saved links I saw that they are no longer valid. I wanted to know if the creator is still working on any of this or if he abandoned all these projects. If so, it seemed useful to contact him to find out if he is willing to release or at least sell any of this.
one of the links https://mud-tested-ground.glitch.me/