3D Four in a Row

■ 3D Four in a Row Line up four balls in any straight line — across, up, or diagonally — on a 4×4×4 board. Balls stack from the bottom of each rod. One minute to learn, surprisingly deep to master: 76 winning lines to fight over. ■ A Serious AI Powered by a neural network trained with AlphaZero-style self-play. Difficulty comes from search depth, not artificial handicaps, so every level plays naturally. 8 levels, from Lv1 Beginner to the mysterious Lv8 Level gaps tuned with thousands of measured self-play games Win games to unlock the next level The top level is "Death Mode": all assists forced off ■ Comfortable to Play Rotate the board with one finger, pinch to zoom Two-tap moves with a preview ball prevent misplays Opponent threats in red, your winning moves in gold (optional) One free undo per game; further undos make the game unranked Color-coded board sides keep you oriented Per-level match records ■ Private by Design Fully offline. No data collection, no ads Japanese / English Can you reach Lv8?