Final answer:
The four major Panhellenic games were called the "crown" games because winning one of these games represented the highest achievement and honor in Ancient Greece.
Step-by-step explanation:
The four major Panhellenic games were called the "crown" games because they symbolized the highest achievement and honor in Ancient Greece.
 Just like a crown represents victory and triumph, winning one of these games was seen as the ultimate accomplishment for athletes. 
The winners were celebrated and praised, and their victories became a source of great pride for their city-states.