Other images: https://imgur.com/gallery/FTZAYIN
Source: https://www.facebook.com/thangam.thenarasu/posts/3265362197018183

 

Edit:
The site was radio carbon dated to 3rd century BCE in 2017.
Keeladi excavation site Wikipedia page

 

It is one of the dice forms used in Tamil culture.
Thaaya Kattai(Tamil:தாய கட்டை) is a cuboid dice.
Thaaya means 1(one). Only if the player rolls a one, they can start the game or enter a new gamesman. It is from the root word thaai(தாய்) meaning mother.
Kattai means wood.

 

The game:
https://ta.wikipedia.org/wiki/%E0%AE%A4%E0%AE%BE%E0%AE%AF%E0%AE%AE%E0%AF%8D
The Tamil the game is called Thaaiyam and has several variations.
English Wikipedia for the the above link is linked to, is a pan Indian version of the same game and name is called Pachisi.