A Modern Tribute to Classic 3D Tic-Tac-Toe

Immerse yourself in the minimalist and strategic atmosphere of early video games with XO4. Face a sharp AI in a 4×4×4 cube where every move counts. Win by aligning 4 pieces in a straight line—vertical, horizontal, or diagonal—across all three dimensions. Simple rules, addictive gameplay, and surprising cerebral duels await.