Styles and Colours may vary - Mega Drive control pads are the logical progression from Master System control pads. Copying a system set up by Nintendo, the three button Mega Drive control pad adds, as the name suggests, an extra face button (or "Trigger" as it was initially called), C, to go with A, B and Start. A and B map to 1 and 2 on a Master System controller, while Start eliminates the need for a pause button placed on the console unit itself. Mega Drive controllers are notable for being one of the first control pads to be ergonomically designed for the user's hands. Though improvements were made in the coming years, previous systems had cornered edges with their controllers, meaning they were often uncomfortable to hold after several hours of play. The Mega Drive controller is rounded, and has its buttons placed in easier to reach positions.