This is the code cracking Mastermind game. Don't let our simplistic user interface fool you, this is a very powerful Mastermind App. Among other things, this App has a built in AI that can help the user to suggest test-keys (this feature can be turned off).
The App has three game modes: 1) User vs Device, 2) User vs User, and 3) Device vs User.
Configure the length of the key (up to 6), the number of different colors (up to 9), etc. You may also turn off the AI helper, or restrict its usage to at most 3 times etc.
The App has no Ads and no subscription fees.
With Family Sharing set up, up to six family members can use this app.