Version 1.2 of World Cup Soccer ~ World Championship Soccer signifies a more significant update than a simple revision.  Released for the Sega Genesis, it probably includes more substantial changes and improvements over previous versions. Sega likely oversaw the development and release, making adjustments to enhance gameplay, address bugs, and potentially add new features. The specifics of the version 1.2 upgrade would require consulting game documentation or reviews to understand the improvements fully. 

World Cup Soccer ~ World Championship Soccer (Japan, USA) (v1.2)

World Cup Italia '90 (Europe)