Nested 2D->2D table to display group of 4 targets on a 3x3 (Letter quads)

[abunickabhi]

I want to check if such softwares are possible to write up without much expertise,

The webpage hosting the program will make 3D visual tables using any software
so there will be a 2D grid of letter pairs
and once the user clicks a letter pair, letter quads emerge as another 2D grid.
Basically a nested CoLPi

https://bestsiteever.ru/colpi/