The Tower Cube (2x2x3), popularized by Katsuhiko Okamoto in the 2000s, is a 2x2x3 cuboid puzzle with 8 corners and 4 centers, offering 1,327,104 combinations. Unofficial solves average 5-10 seconds. With 2×2 faces turning 90° and 2×3 faces at 180°, it’s solved layer-by-layer using algorithms like (R U R’ U)3. A collector’s gem, MoYu’s stickerless models turn smoothly. Rubikverse.com’s Tower Cube Simulator simulator provides a simple way to scramble and master this sleek cuboid.