Numbrella turns a single, elegant idea into a puzzle you'll keep coming back to. Every cell in the pyramid equals the sum of the two cells directly beneath it, so from just a handful of starting clues you can reason your way to the entire solution — one deduction at a time.

There's no luck involved and no guessing required. Correct answers lock into place, wrong ones shake instantly, and pencil marks let you track candidates in the trickiest cells. A built-in timer keeps things tense, and the optional global leaderboard lets you see how your fastest solves stack up against players everywhere.

Five hand-tuned difficulty tiers take you from a quick warm-up to a serious brain workout: Easy, Medium, Hard, Master, and Grandmaster — each with more rows and fewer clues than the last. Whether you have thirty seconds in line or thirty minutes on the couch, Numbrella is the number game that fits.

Features list

• One simple rule — every cell is the sum of the two below it

• Pure logic — every puzzle is solvable by reasoning; no guessing

• Five difficulty tiers — from friendly Easy to the full Grandmaster challenge

• Pencil marks — jot down candidates in tight cells

• Beat the clock — a built-in timer for every solve

• Global leaderboards — compare your best times with players worldwide

• Calm, distraction-free design — made for one-more-puzzle sessions

• Free to play — with light, unobtrusive ads between games