In order for the EightPuzzleGame to compile, you need to add the following library projects that are available in the SDK:
- SmartExtensionAPI
- SmartExtensionUtils
- SmartExtensionInternalUtils
In your case, it is the API project that is probably missing. You can see what library projects that are missing by checking the project properties. Example:
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…