Hello guy, I will guide u how to run my project. First, u will check your java version. Come Command Prompt(cmd) and type 'java -version'. If it displays the 'java' is not recognized as an internal or external command, your computer did not have any versions of the java. U need to install The Java Standard Edition. -> Type jdk in google search and in first link, U can install the lastest jdk.( I use 17.0.2 version) The most common error is u dont set the environmental variable. To fix this error, u have to find the javac app in the file u just installed and copy this path. After that, u go to This PC then properties, check the advanced properties, select the environmental variable. Carefully! Follow me!. U choose New user variables and write the variable name (path) and variable value by the path u just copied. After that, u can check by using the 'javac -version' in cmd. Second, U need to install eclipse (its up to u). Go to the https://www.eclipse.org/downloads/ and install the lastest version. After the download is completed. Run this then press in eclipse IDE for Jave Developers(accept the agreement) #https://github.com/DuKyHan/Minesweeper_reborn/