Class names are case sensitive. It is possible that you have created an interface called game but you refer to it in your Class interface declaration as Game which the compiler cannot find.
You need to read up on how Java classpaths work and how you should organize your source code. Basically, your problem is that when javac compiler compiles "Class. Java", it does not expect to find "Game.
Class" in the current directory. It (probably) is looking for it in "Impl/Game. Class".
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