8 puzzle is a sliding puzzle that consists of a frame of randomly ordered, numbered square tiles with one missing tile. The object of the puzzle is to place the tiles in the right order (see picture) by using sliding moves to utilize the empty space. You can read more about this kind of puzzle on Wikipedia.
Our puzzle is presented as a 3x3 matrix with numbers from 1 to 8. Zero is the empty cell. You can "move" the empty cell in four directions: up--"U", down--"D", left--"L", and right--"R". You need to return a sequence of moves to solve the puzzle....
CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin --ff
checkio install-plugin --chromium