Description

Protect primes, eject composites, and turn number sense into crisp puzzle wins. Drop blocks to build composite chutes while keeping primes perched safely above the exit. How to play Each column stacks numbers above a gate. Tapping a block drops its value; your aim is to route composites out while primes remain. Use quick filters: even > 2 is composite; ends in 0/5 means divisible by 5 (except 5); digit sum multiple of 3 signals divisibility by 3. For trickier values, test small primes 2, 3, 5, 7, 11. Sequence matters: free a composite above a prime by clearing side supports, not by dropping the prime. Build chutes so successive taps funnel several composites. When a prime is precarious, park a harmless composite under it as a temporary support. Locks/switches? Plan routes that pull composites through toggled gates without exposing primes to gravity traps. Controls Desktop: Click to drop; R to reset; I to open divisibility reference. Mobile: Tap to drop; long-press for reference card; on-screen reset. Tips & strategy Scan giveaways: Evens (≠2), 0/5 endings, digit-sum ≡ 0 (mod 3). Side-clears: Free composites without dropping primes. Prime pedestals: Park a composite to guard a prime. Build chutes: Chain multiple composite exits in a row. Verify mid-range: Test small factors before assuming “prime.” Modes & variations Classic, Locks & Switches, Timed Tests, Endless Columns. FAQ Q: I forget divisibility rules. A: Open the in-game reference—explains tests without solving for you. Q: A prime keeps falling. A: Leave a temporary composite beneath it until the composite chute is ready. Q: Accessibility? A: Color-independent shapes mark prime/composite states. Q: Who made the game? A: Not disclosed by developer.

Instruction

Mouse click Touch

Specifications

• Easy to play