Java 8 or above is required
wget https://github.com/olegtarapata/puzzle15/releases/download/1.2/puzzle15.jar
java -jar puzzle15.jar <size (from 2 to 10)>
Or build project:
Maven is required
git clone git@github.com:olegtarapata/puzzle15.git
mvn clean package
java -jar target/puzzle15.jar <size (from 2 to 10)>