The player can unlock Mako as an opponent, by winning the weekend tournament a certain number of times. The player can then Duel him at the card shop on Mondays, near the shopping district on Tuesdays and Thursdays, the Coliseum on Wednesdays and Saturdays, the K.C. Tower on Fridays and the hometown on Sundays. He also faces the player in the Weekend Tournament, the K.C. Tower Tournament and is a potential round two opponent in the Sugoroku Tournament. When the message "Mako is not looking too good" appears on the screen, if the player talks to Mako, while their active Deck contains "Umi" and all its monsters are WATER-Attribute, he will challenge them to a special Match. In the Match, "Umi" is the default terrain and the player wins cards from the Water Collection, if they win.
