This may be stupid but it's frustrating

So I imagine this is fairly similar if your using windows, the following worked for me on Linux Mint: Download javafx from here: openjfx As I initially I got the following exception: "java.lang.module.FindException: Module javafx.base not found" I've referenced in part the instructions from openjfx-docs but added in some useful extra steps so that it incorperates the Codegym Game library: Within your file directory 1.Extract the contents of the javafx sdk zip file into the "/home/cobud/CodeGymTasks/8.Games/src" folder. 2.Go to the "CodeGymTasks/8.Games/lib" folder and copy the "desktop-game-engine.jar" file into the "MinesweeperGame/src/javafx-sdk-11.0.2/lib" folder. Within IntelliJ 3.Go to "File -> Project Structure -> Libraries" and add the JavaFX SDK as a library to the project. Point to the lib folder of the JavaFX SDK. 4.Go to Preferences (File -> Settings) -> Appearance & Behavior -> Path Variables, and define the name of the variable as PATH_TO_FX, and browse to the lib folder of the JavaFX SDK to set its value, and click apply. 5.Next click on Run -> Edit Configurations and add this line: --module-path ${PATH_TO_FX} --add-modules javafx.controls,javafx.fxml If you want to setup your your own test version in intelliJ, go "File -> New -> Project", select Java FX, click next, name it, click finish, follow steps 1-5 and amend the file locations to the Java Fx project src folder. Hope this helps

Wouldn't be able to help without seeing your whole code