This is Knucklebones a minigame from the game Cult of the Lamb.
I was inspired to build this from this video from Makers Muse:

Assembly

To Assemble all you need is 6 magnets that are 6mm x 3mm and a strand of spare filament

How to play!

To play the game you only need 17 12mm dice

Each player takes turns rolling one D6 and placing it into one of their 3 columns. The dice are added up and the goal is to have the highest score by the end of the game (when one player fills all 9 spots).

Multiple die of the same number in the same column are added together and then multiplied by the quantity in that column (ie, two 6's becomes (6+6)X2 = 24.

However, your opponent may place a dice of the same number in their opposing column and remove all yours of the same number!

Like the game? Check out Cult of the Lamb! https://www.cultofthelamb.com/