🔺 Number Pyramid

Number Pyramid is a mental arithmetic puzzle. Each brick holds the sum of the two bricks directly beneath it, so the whole pyramid is one connected chain of additions.

How to play

1. Some bricks are given; the rest are blank.
2. Work out each missing value — add upward, or subtract downward from a known total.
3. Tap a brick and type the answer. Wrong cells turn red when you check.

Strategy tips

• Start with bricks whose two children are both known — those are forced.
• Work downward too: a blank child equals its parent minus its sibling.
• On bigger pyramids, clear the densest region first — isolated gaps stay stuck until neighbours fall.

FAQ

Is there always exactly one solution?

Yes — every generated pyramid has a single unique solution, so guessing is never required.

What is a good time?

Under 60 seconds on easy is solid. Sub-30 means the additions are landing in one pass.

Do I have to fill bricks in order?

No — tap any blank brick and type its value. Solve in whatever order the numbers give themselves up.

Difficulty affects grid size and time is your score — finish fast, post to the daily leaderboard, or race a friend.

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