Mai Valentine ( Duel Links ) Mai Valentine is a playable Legendary Duelist in " Yu - Gi - Oh ! Duel Links " . This is a video game depiction of Mai Valentine , a character from the " Yu - Gi - Oh ! " anime . She appears in - game after the player reaches Stage 10 of Duel World ( DM ) and can be unlocked as a playable character starting at Stage 11 . Green Gate Key s are required to Duel Mai Valentine at the Gate . The special event Elegant Mai Valentine has Mai use different Decks and drop different rewards than usual . Biography . After the player advances to Stage 10 , they will encounter Mai for the first time , who is engaged in a Duel with Jay . After Mai ' s apparent victory , she comments that she originally had high expectations when she heard all the top Duelists would be in Duel World , and wonders if there is anyone in Duel World who can give her a challenge . Until the player defeats Mai at least once , whenever they challenge Mai to a Duel , she remarks that the only way to get further is by defeating her . She then observes that the player is already wondering what the next Stage will be like , and chides them for thinking too far ahead ; instead , she prompts the player to never take their eyes off their opponent , especially since it ' s her . She concludes her dialogue by stating she ' s definitely in the mood for a Duel . Until the player defeats Mai at least once , whenever they lose to her , she will express disappointment and claim their Duel was so easy that she could have won it in her sleep . However since she ' s in a good mood , she tells the player , she ' ll give them some advice : a Duelist ' s spirit isn ' t tested when they win , but rather when they lose . In other words , she says that if a Duelist has heart , then a defeat won ' t break them , before rhetorically asking the player if they have heart . At this point , she says she ' s given enough advice to the player , and that she hopes the player will give her a challenge the next time they Duel her . Upon Mai ' s first defeat , she states that she ' s impressed , but that it doesn ' t mean she ' ll give up her dream . She goes on to state that a Duelist ' s courage is put to the test after a defeat , not a victory , and that she is confident that her loss will strengthen her , leading her to achieve her dream . Mai then leaves the player with a warning that she ' ll be much tougher to defeat the next time they Duel . After the player redeems their final unclaimed reward for Mai Valentine ' s Character Unlock Missions , they will encounter Mai again , who declares that because her friends are always around to help her overcome any obstacle , her spirit won ' t be broken that easily , and that she ' ll fight to the end . She tells the player to watch as her monsters dance their way to victory , and shows them her " Harpie Lady Sisters " card . Decks . Set Sail for the Kingdom . Level 20 . Skill : " Dueling Arena : Mountain " Level 40 . Skill : " Dueling Arena : Mountain " Level - up rewards . The following lists are the rewards the player accumulates from having Mai Valentine reach a certain Level . Duel rewards . When dueling against Level 40 Mai Valentine , these are the only cards that can drop ; at lower levels , cards from the standard pool for Legendary Duelist s may also drop . When dueling against Level 40 Elegant Mai , these are the only cards that can drop ; at lower levels , cards from the standard pool for Legendary Duelist s may also drop .