The Number Detective is based on the "I Spy" children's guessing game played by millions of kids everywhere.

No doubt you played "I Spy" with a parent, with your child or with a sibling on one of those long family drives. Each player would take their turn by saying the phrase "I spy with my little eye, something _____", usually filling in the blank with a color, shape, etc. The Number Detective uses NUMBERS instead. The object of the game is to guess a randomly generated number, between 1 - 999, before your opponent can. Clues are provided to help you narrow your guesses.


RANGE INDICATORS. Range Indicators depict the proximity of the guess to the winning number. If the "Hint Arrows" option is enabled, Range Indicators are filled in with either an UP or DOWN arrow, indicating that the guess is less than or greater than the winning number. 

COMPUTER OPPONENTS. You may choose one "Human" opponent or up to three "Computer" opponents.
The first player is always Human. The second player can either be a Human or a Computer type.

PEEK OPTION. Depending on age/skill level, a Human player might want to see the guess(es) of his/her opponent(s). Pressing the "Show Last Guess" option will display a mini-window with last guess and Range Indicator of all players.

SMART COMPUTER OPPONENTS. Each computer opponent uses its previous guess and Range Indicator independently so as to continually reduce the range of its next random guess.

SWARM MODE. Swarm mode allows computer opponents to collaborate. Each computer guess is still randomly generated, but the range is continually refined with each computer guess. This causes the swarm guess to converge rapidly on the winning number.

CHEAT MODE: Sometimes a parent might need to know the winning number ahead of time in order to help direct a child. If the right hand (landscape)/lower (portrait) panel is pressed and held for more than two seconds, the winning number will be revealed.

Good Luck!

version 1.0.4
copyright 2021

What’s New

Version v4

Expanded HELP/ABOUT file

Ratings and Reviews

5.0 out of 5
4 Ratings

4 Ratings

AnnRohan ,

Fun for grandkids

My 7-year old grandson loves this little game. His deductive reasoning skills have improved and he’s having fun all the while. Great way to pass the time while I social distance. No annoying ads, no in-app purchases and it’s FREE!

App Privacy

The developer, Neil Rohan, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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