Published in 1992, the original Super Sidekicks (known as Tokuten Ou, "Goal-Scoring King" in Japan) was SNK's first soccer video game. It features 12 teams divided into two groups which compete for the "SNK Cup" (the main differences between teams is their formations on the field):
Group A: Germany, Italy, Spain, England, Mexico, Japan
Group B: Argentina, Holland, Brazil, France, United States, South Korea
Your team plays against all the others in your group, then it goes into an elimination tournament's semifinals and then the final to win the cup. There was also a hidden feature in the game, which wasn't documented, and affects a single player game. During a free kick for the CPU if the player has tapped button A for player two, the cpu performed a short-shot, while pressing the button A performed a longer kick.
One noted mistake was that Spain's kit would actually resemble Portugal's. Portugal would not be in the game until Super Sidekicks 3.
Source: Wikipedia, "Super Sidekicks", available under the CC-BY-SA License.