Mario Kart Double Dash
- 1). Unlock the Mario Kart Double Dash's All Cup Tour. Open the Grand Prix single player mode from the game's menu. Compete and finish the Mushroom Cup, Flower Cup, Star Cup and Special Cup in both 50cc and 100cc speeds to unlock the 150cc speed. In the 150cc mode, beat all four cups again to unlock the All Cup Tour Mode.
- 2). Unlock Mario Kart Double Dash's Mirror Mode. Start the All Cup Tour from the Grand Prix single player mode. Complete all 16 races using your preferred character. In order to unlock the Mirror Mode, you must finish the 16 races with an overall standing in first place. Finish the majority of races during the All Cup Tour in first or second place to ensure a successful finish.
- 3). Win the Star Cup within Mirror Mode. Select "Mirror Mode" when the game prompts you to pick a speed to race in. Select the Star Cup from the Grand Prix single player mode. Finish the four races in first place in the final standings. King Boo will be subsequently unlocked as a selectable player.