I've noticed that the game duplicates tiles under certain conditions. The bug was fairly easy to produce by swapping two pieces repeatedly. I've recorded a short video demonstrating the issue. This was with API 23 in an emulator (as well as my device) with revision e22e6cf of your app.

See https://youtu.be/0NPei9gyN_Y .

Expected behavior
When options are been selected, option been clicked on should show some response in accordance to what it is selected for.

Actual behavior
When puzzle is been played. Clicking on the reset or restart option, and the other two option by the left doesn't respond.

How to reproduce
Download application.
Make drawings of your choice, then click on the puzzle option at the top bar.
Select stage or level of your choice
After game is been played, then click on the options located below. After the pause and resume option, the rest are not responding.

Device: Tecno wx3pro
App version: 1.0
Operating system: Android Nougat 7.0

Recording of the bug
https://youtu.be/MdEusbczHYM

Bug description
The pause button on the puzzle solving screen only pauses the timer but the user can still continue to solve the puzzle, which leads to possible inaccurate times.

Steps to reproduce
Draw a picture
Move to the jigsaw puzzle page
Select any difficulty
Pause the timer

Expected behaviour
Pause the timer and block any attempts to move the puzzle pieces around.

Devices tested on
App version 1.0
Physical device: Pixel 6 Pro Android, 13 Tiramisu (API 33)
Virtual device: Pixel 2 & Nexus 9, Android 9.0 Pie (API 28)

Improve/measure code coverage to at least 80%

Expected behavior
When all the puzzle pieces are in their correct place ie. the puzzle is solved, a message should be shown informing the win. Or the app should take the user back to the canvas area automatically. Basically something to indicate that the user has solved the puzzle.

Actual behavior
When the puzzle is finished, nothing happens. The timer continues. No indication of finishing the puzzle. The user has to click the back-button theirselves to go back to the canvas area.

How to reproduce
Download application.
Make drawings of your choice, then click on the puzzle option at the top bar.
Select stage or level of your choice.
After the puzzle has been finished, wait.

Devices tested on
App version 1.0
Device: Nexus 4 (API 30)

Hi,

Since this app is Apache v2 licensed, are you considering the fact to add it to F-Droid? There is a strong community behind, that do not use Google Play nor anything else, except F-Droid.

You can find some documentation here.

Otherwise, if you don't want to work on the inclusion of this app by yourself, would it be ok for you if someone else do it for you?

Hello! As you may have observed, minimalist or simplistic app icons are the modern trend right now as opposed to complicated and detailed icons so here's my suggestion for the new icon for the app.

What do you think?

Expected behavior
When puzzle is been selected, then while playing or making a move. Design or drawings from puzzle should still remain intact.

Actual behavior
When puzzle are relocated, respective drawings keeps changing and sometimes making puzzle uneasy to get.

How to reproduce
Download application.
Draw preferred puzzle of your choice, the select the puzzle option at the top bar.
Select stage or level to be played. Then after making movement. Responds keep changing at times.

Device: Tecno wx3pro
App version: 1.0
Operating system: Android Nougat 7.0

Recording of the bug
https://youtu.be/kieS6dPgenQ