This project turns a humble PCB business card into a fully-playable Tic-Tac-Toe handheld. The 70 × 35 mm (2.76 × 1.38 in) two-layer board prints my contact details on the silkscreen, but the real hook is the nine bi-color LEDs: blue and red light up the grid to show each player’s moves. Control is deliberately minimal—three tactile switches marked PREV, OK and NEXT let you scroll across the cells, confirm a move and start a new round. A single alkaline coin-cell keeps the game running for roughly six hours of continuous play, and when the firmware needs a tweak there’s a Tag-Connect six-pin footprint hiding on the edge. It’s a pocket-sized demo of low-power design, playful UX and shameless self-promotion.