Part 1
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To go to the North-West and to take the bone. 
To go to the EAST and to give the bone to the dog. 

Part 2 
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To go to the castle. 

Part 3 
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To go in the kitchen to South-west and to take the key. 
To go to the South in the room of the painting and to activate the lever. 
To go to see the magician in the room in the EAST and to speak him. 
To go to the cellar to see the dragon. 
To enter the laboratory. 
To open limp it and to press on the button. 

End of episode 4. 