Filip asked me to post the following:

Xpuzzle 1.2 has been released. New simple levels have been added, and a new 
UI has been created. I think that would be a good practice environment for 
Metamath newbies.
-- Filip

On Tuesday, September 1, 2020 at 6:18:22 PM UTC-4 Norman Megill wrote:

> Filip Cernatescu asked me to post this.
>
> -------- Forwarded Message --------
> Subject: New metamath game on Android
> Resent-From: nm
> Date: Tue, 1 Sep 2020 12:22:06 +0000 (UTC)
> From: Cernatescu Filip <cernatescufilip at yahoo.com>
> To: Norman Megill
>
> Hi Norm!
>
> I have created an Android App called XPuzzle.  It is a puzzle with math 
> formulas derived from the Metamath system, it is a lightweight Metamath.  
> Problems and formulas are stored in a .mm file.
>
> Formulas are axioms ($a) and they belong to public domain, problems ($p) 
> are theorems and they are registered to my name.  I have attached the .mm 
> file to the email, and it is included in the .apk file.  For now the other 
> properties of the formulas and problems are hard coded in the java program, 
> but it the future if the game has a public, these properties will be 
> written in a .mm file comment.
>
> Xpuzzle has a web page:  https://www.xpuzzle.co and at the bottom of that 
> page is a link to the Google Play Store, where the app can be found.  
> Please put this web page to the us.metamath.org.  If my game has a 
> public, I will put ads on the app and I will donate a percent from the 
> income to the Metamath Foundation.  Please also put an announcement to the 
> Metamath forum (I am unsubscribed).
>
> Thank you very much!
>

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