Remote play board
Exercise in robotics, IoT etc.
Build a square play board and add a metal slides to two opposing sides. Build a servo-controlled “pick and place” system, maybe with electromagnets - each play piece would then be a flat disk with a metal base for the magnet to grab.
→ There are some DIY laser carving sets that have the accuracy and the parts that would work nicely - just replace the laser with a magnet..
Build a simple server software that takes a file as input. The file should contain plain-text commands to move the piece(s). This could be expanded with a web pages with a GUI… Play by email would be fun too with parsing of the message etc.
Arimaa would be a great game to build with this but a tic-tac-toe is probably more realistic to start with.