Koopa Troopas are turtle-like creatures from the Super Mario video game series created by Nintendo. They are typically characterized by their green or red shells and are known for their role as common enemies in the games. Players can defeat them by jumping on their shells or using power-ups. In the games, Koopa Troopas often walk back and forth on platforms and can be found in various environments, from grassy fields to castles. They can also retreat into their shells for protection, making them a versatile challenge for players.