I came across non-transitive dice recently while reading Humble Pi by Matt Parker.
This triggered a bunch of research, wherein I found this Dice Shop, this gem of a book by Bogomolny (Cut the Knot) and I have ordered these blank dice from Amazon to try some of these ideas out with real dice.
In the interim, I created this Google Colab to check on the probabilities of various events with the Grime Dice.
Also check this Singing Banana site!
To be continued...