Prime Tower: Math Puzzle

A crane swings a numbered block over your tower. Tap to drop it. If the number fits the rule, it stays. If not, the tower shakes. No ads. No in-app purchases. No account. No tracking, and no data collected. Works completely offline. Prime Tower is a calm, colorful stacking puzzle that quietly teaches the number sense behind middle-school math: factors, multiples, prime numbers and divisibility. No reading marathons, no quiz screens - just one tap and a decision: does this block belong on the tower? WHAT YOU'LL LEARN - Factors and multiples: which numbers divide which, and why - Prime numbers: why 2 is the only even prime, and why 9, 15 and 21 are not - Divisibility rules for 2, 3, 4, 5, 6, 9 and 10, the shortcuts that make mental math fast - Common multiples, the idea behind the lowest common multiple - Prime factorization: breaking a number into its prime building blocks Written for grades 6-9 (ages 11-14), and good for any adult who wants their number sense back. HOW IT WORKS - The crane swings back and forth. Tap anywhere to drop the block. - A dashed guide shows exactly where it will land. - The sign at the top tells you the rule. Check the number, then decide: place it, or let it fall aside. - Every landing explains itself: "18 and 12 share a factor, but neither divides the other." FOUR RULES, ONE TOWER - Factor or Multiple: the block must be a factor or a multiple of the number below it. - Primes Only: only prime numbers may stay. - Divisibility: the block must be divisible by the number or numbers on the sign, including common multiples. - Prime Factors: break a number down into its prime factors, block by block, until 1 is left. 12 LEVELS, 3 STARS EACH Start with simple factors and climb to timed levels where the rule changes every three floors. Earn half-stars for finishing fast, keeping a streak of correct blocks, avoiding drops and passing on the first try. A perfect run earns all three. MADE TO BE FRIENDLY - One-finger play, portrait mode - Bright, jelly-candy look and cheerful voice cheers - Every wrong block is a lesson, not a game over - No timer at all in the first six levels Perfect for students learning factors and primes, parents who want screen time that sharpens math, and teachers looking for a five-minute warm-up.