Short answers, pulled from the story.
Street Fighter II: Champion Edition is a 1992 arcade fighting game by Capcom, released as the first update to Street Fighter II: The World Warrior (1991). The main changes are the addition of the four Grand Masters (Balrog, Vega, Sagat, and M. Bison) as playable characters, the introduction of mirror matches, and refined balance across the original eight fighters.
Street Fighter II: Champion Edition's worldwide arcade earnings exceeded $2.3 billion in gross revenue. In Japan alone, 140,000 hardware units were sold, earning approximately 22.4 billion yen ($182 million) in hardware sales. It ranks among the top three highest-grossing arcade games of all time, after Pac-Man and Space Invaders.
The Grand Masters are Balrog, Vega, Sagat, and M. Bison. In World Warrior they were CPU-only final opponents, but Champion Edition made all four playable. They were toned down from their CPU versions but remained stronger than the original eight fighters.
Champion Edition was released on arcades, PC Engine, Genesis/Mega Drive (as Street Fighter II': Special Champion Edition), X68000, Master System, Sega Saturn, PlayStation, PlayStation 2, Xbox, PlayStation Portable, PlayStation 4, Xbox One, and Nintendo Switch. Several versions were Japan-exclusive, and the Master System version was exclusive to Brazil.
The Genesis/Mega Drive version, Street Fighter II': Special Champion Edition, sold 1.665 million cartridges. Sales fell below Capcom's expectations, partly due to competition from the original Mortal Kombat (1992), though it remained a best-seller in Japan, the United Kingdom, and the United States.
Gamest awarded Street Fighter II Dash Best Game of 1992 in its Sixth Annual Grand Prize, published in February 1993. The game also placed third in Best VGM, sixth in Best Graphics, and fifth in Best Direction. The Street Fighter II Image Album took first place in the Best Album category in the same issue.