Pick one: flat squares (two dimensional) or spinning cubes (three dimensional).
A number as a flat square — 3 × 3 = 9. Every squares game: see it, tap it, type it, learn the odd-number pattern, and climb the Squares Adventure.
A number as a real cube you can spin — 4 × 4 × 4 = 64. Every cubes game in one place.
The rectangle both ways — the same block multiplied and divided.