# Numerical Tic Tac Toe — Evens vs odds for 15-in-a-row.

> Number-based tic-tac-toe variant where players sum numbers to 15. (iPhone/iPad app by Oak Snow Consulting LLC.)

- Source: https://appshunter.io/ios/app/numerical-tic-tac-toe/id6444579628 (this page in markdown: same URL + `.md`)
- Developer: [Oak Snow Consulting LLC](https://appshunter.io/developer/356437330)
- Category: Games, Casual, Board
- Price: Free
- Rating: 5.00/5 from 3 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 8 MB
- Languages: American English
- Released: 2022-11-20
- Data updated: 2026-06-01
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/numerical-tic-tac-toe/id6444579628/reviews.md

## What is Numerical Tic Tac Toe?

Numerical tic-tac-toe is a variant of tic-tac-toe that replaces the traditional Xs and Os with odd and even numbers. Players alternate placing numbers, aiming to form a line that adds up to 15. 

The game is played on a normal nine square tic-tac-toe board. The odd player begins with the numbers 1, 3, 5, 7, and 9. The even player begins with the numbers 2, 4, 6, and 8. Odd always goes first. The two sides alternate placing numbers on the board in empty squares.

Numbers cannot be repeated. So, there will only ever be a single instance of each number on the board. The first player to put a number down that achieves a sum of 15 composed of three numbers in a row, column, or diagonal wins the game. Note, that two numbers adding to 15 is not sufficient. So, a 6 next to a 9 is not a win.

*Features*
- Play against an AI opponent
- Play against a friend
- Three levels of difficulty
- Customizable colors

*History*
Numerical tic-tac-toe was invented in the late 1950s by American mathematician Ronald Graham. A similar game was contemporaneously invented by P.H. Nygaard.

In 1990, George Markowsy wrote a computer program that solved numerical tic-tac-toe. He proved that 1 in the top middle slot is a winning first move for odd. In other words, in perfect play, odd wins the game. Markowsky published his findings in The Journal of Recreational Mathematics.

## Key features

- Odd and even number gameplay
- Sum to 15 win condition
- AI opponent
- Local multiplayer
- Three difficulty levels
- Customizable colors

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/numerical-tic-tac-toe/id6444579628/reviews.md

### 5/5 — One of a Kind!

*2022-12-28*

There only seems to be this app on the App Store for numerical tic-tac-toe. Now I can seem like a super big brain when I whip this out at a party. 😇

## Frequently asked questions about Numerical Tic Tac Toe

### What is Numerical Tic Tac Toe?

Numerical Tic Tac Toe is a strategy game where players use odd and even numbers on a tic-tac-toe board. The goal is to be the first to create a line of three numbers that add up to 15.

### How do you win in Numerical Tic Tac Toe?

You win by placing numbers on the board such that three of your numbers in a row, column, or diagonal sum exactly to 15. Two numbers adding to 15 is not a win condition.

### Can I play Numerical Tic Tac Toe offline?

Yes, you can play against the AI opponent or a friend locally on the same device, making it playable without an internet connection.

### Does Numerical Tic Tac Toe have ads?

Yes, Numerical Tic Tac Toe contains advertisements. It is available for free and supported by ads.

### What devices is Numerical Tic Tac Toe available on?

Numerical Tic Tac Toe is available on iPhone and iPad devices, as indicated by its supported devices list.

### What are the difficulty levels in Numerical Tic Tac Toe?

The game offers three distinct levels of difficulty for the AI opponent, allowing players to adjust the challenge to their skill level.

### When was Numerical Tic Tac Toe last updated?

The latest version of Numerical Tic Tac Toe is 1.0.2, which was last updated on January 2, 2026.

### What is the age rating for Numerical Tic Tac Toe?

Numerical Tic Tac Toe has an age rating of 4+, making it suitable for a wide range of players.

## Version history (last 3 releases)

### 1.0.2 — 2026-01-02

- Bug fixes

### 1.0.1 — 2022-11-20

- Bug fixes

### 1.0 — 2022-11-20

No release notes.

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All apps by Oak Snow Consulting LLC: https://appshunter.io/developer/356437330

## Related topics

[numerical tic tac toe](https://appshunter.io/ios/topics/numerical-tic-tac-toe)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*