Tetris

Modified 4x4 that can be stacked horizontally and vertically

You can build on the first block either to the right or down. There are headers on all sides of the PCB. You can connect the board with solder bridges or with headers and shunts.

Up to 4 can be connected together. Most of the Tetris shapes can be made, except for the big square. It runs the same firmware as the regular 4x4. Gerber files on git.

All the different ways the boards can be connected. Black square is the board with the controller. The original 4x4x4x4x4 can only be assembled as a horizontal row.

The firmware treats it as a straight 4x16 matrix regardless of layout.