81900
The player drives over dots while traveling around each ring , similar to maze games such as Sega 's Head On ( 1979 ) and Namco 's Pac-Man ( 1980 ) .
 Sega, Namco
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sega, Namco