This is one from my archives.
Built in 2017 but might still be interesting.
It's what the name says
4 in 1 row but then a 3D version
Built with
1 x Arduino Mini Pro
1 x DF player mini
125 WS2812b LEDs
27 push buttons
125 x clear frosted beads
clear adhesive
lots of plexiglass
even more patience and time
manual with many photos, program, diagrams and some explanation in attached pdf files.
also not so clear video file attached. (maybe elektor should review the limit of 15MB)
also available on github
https://github.com/thieu-b55/4-in-a-row-3D

Good luck and have fun,
thieu-b55