If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Scooby has three tries to find the gang. You lose a try if Scooby's fright factor gets too high but a Scooby snack can help which you will find inside the creepy castle.Open doors by clicking on them. You can also find objects inside that can help you avoid the ghosts like a wooden plank to shut doors among others. Enjoy!