Yu - Gi - Oh ! - Duel 024 " Capsule Monster Chess " is the twenty - fourth chapter of the " Yu - Gi - Oh ! " manga . This chapter was originally printed in the " Weekly Shōnen Jump " magazine in Japanese . Its first English release was in the " Shonen Jump " magazine . It has been reprinted in volume 3 of the and volume 2 of the bunkoban . This chapter contains the first appearances of Mokuba Kaiba and " Capsule Monster Chess " in any media . Summary . Candy store . On the way home from school , Yugi stops by a candy shop , which always has a crowd of kids around it , fussing over a " Capsule Monster " coin machine . Yugi explains that " Capsule Monsters " , or " CapMon " for short is the biggest thing with elementary and junior high school kids . The toy monsters come in egg - shaped capsules . There are 250 different monsters and each capsule has a number from 1 to 5 indicating the monster ' s Level . The game is played like chess on an 8x8 grid . Each player pits their 5 best monsters against each other . There are 50 different boards , each is a battlefield from the mythical planet Garnaster . A player wins the game , by defeating all their opponent ' s monsters . Each monsters has different attack and movement abilities . Neither player can see their opponent ' s monsters until the start of the game . One of the kids cuts past Yugi in the line . Yugi tries to tell him off , but the boy says that Yugi was just " spacing out " . He asks isn ' t Yugi in high school , despite not looking like it and accuses him of being too old to play " CapMon " . Yugi is rebuked , but tries to hide it saying that age doesn ' t matter to a real gamer . The boy decides that if it means that much to him , Yugi can go first this time . Yugi thanks him and fishes a ¥100 ( about $ 0 . 84 US at the time ) coin out of his pocket , as he steps up to the machine . Yugi inserts the coin , but no capsule comes out . He starts to shake the machine in frustration , while the other kids all laugh at him . The store owner , " Old Man Dentures " , arrives and thumps Yugi on the head . He asks if Yugi thinks that he will let him break the machine , just because he lost ¥100 . He yells that the machine is expensive and worth more than Yugi . Yugi apologizes , but then asks himself why he is the one apologizing , when he is the one who lost money . As Dentures continues to rant at Yugi , Mokuba Kaiba , the " Capsule Monster " champion arrives . The other kids are all surprised to see him arrive and quieten down . Mokuba calls for Yugi ' s attention . Yugi wonders how this kid knows his name and tries to figure out who he is . Mokuba tells Yugi not to rack his brains , he doesn ' t know him and this is the first time that they have met . Mokuba on the other hand claims to know all about Yugi . Yugi looks puzzled . Mokuba asks if he knows Seto Kaiba and tells Yugi that Seto is his older brother . Yugi remembers Kaiba , the " Duel Monsters " expert . Mokuba says that his brother masters every game he plays and that Seto is his hero . Mokuba is surprised that a shrimp like Yugi beat his brother . He had thought that Yugi might be cool , but guesses that he was wrong . Yugi looks around at the other kids and notices that they have all gone quiet since Mokuba arrived . Mokuba claims to be pretty good at " CapMon " , having won the last tournament . He asks if Yugi likes to play too . Yugi replies that he is not that good himself , having only started playing recently . Mokuba says that Yugi is just being modest and orders the other kids to get him . The children flock around Yugi , holding up a gun , a stun gun and a knife to his face . These are his followers , Mokuba explains and tells Yugi to not even think of escaping . Mokuba gets hold of the " CapMon " dispenser , telling Dentures that they are taking it . Dentures gets mad and starts to wave his fists . However Mokuba drops a wad of bank notes in front of him and tells him to keep the change . Dentures smiles and says " Please come again " . One of Mokuba ' s followers carries the dispenser and Mokuba turns to Yugi . He says that he is going to take Yugi someplace special and asks if he is excited . Yugi starts to worry , while Mokuba thinks to himself that his brother will be avenged . Mokuba ' s hideout . Setting - up . Yugi is taken to Mokuba ' s gang ' s hideout , which is an abandoned warehouse . He is sat at a crate with a " Capsule Monster Chess " board on it and forced to face Mokuba in a game . Yugi requests that Mokuba take it easy on him , prompting one of the followers to ask if all high schoolers are this wussy . He asks if Yugi has anything to say and another follower threatens that if Yugi messes with them , they will burn his house to the ground . They look at his Millennium Puzzle and decide to smash it , however Dark Yugi appears when they try to take the Puzzle . Yugi orders the " little brats " to get their " filthy hands " off the Puzzle . The two followers withdraw , surprised by his change in attitude . Another one of the boys tells Mokuba that Yugi is no longer the same . However Mokuba knows what is going on and had been hoping for this . He explains what Seto had told him ; that Yugi changes into a different person when he games and this is the Yugi that Mokuba wants to beat . Dark Yugi insists that they get on with it , so Mokuba continues with the rules of their game . He has chosen Battlefield 7 " Crisis Hill " , which is the board that he does best on . Dark Yugi asks him to prepare his " Capsule Monsters " , saying that he can use whatever Levels he wants . However Mokuba has something else in mind . If he was to use his regular collection , Dark Yugi would not stand a chance , which is why he brought the coin machine . They shall take turns drawing capsules from it , starting with Dark Yugi . One of the followers inserts a coin and gives Dark Yugi the first capsule , a Level 1 . He puts in a coin for Mokuba next and gets a Level 5 . He tells Dark Yugi not to complain , as luck is part of skill . This results in 3 Level 1s , a Level 2 and a Level 4 for Dark Yugi , while Mokuba gets 2 Level 4s and 3 Level 5s . Mokuba smirks that it looks like the battle is over before it even started . He thinks to himself , that he has fooled Dark Yugi ; the machine was rigged and he had even payed Dentures to act his part . Before they begin , Mokuba says that the game needs some danger to make it interesting . He holds up a knife and says that if Dark Yugi loses , he gets to cut his finger off with this . Dark Yugi accepts , provided that if he wins , Mokuba will play a Penalty Game as punishment . Monster line - ups . At the start of the game both players place their monsters on the field , while inside their capsules . The only thing that the opponent knows about them is their Level . At the start , the Capsules are removed , revealing the monsters . Mokuba ' s monsters are : He arranges them a checkered pattern . Dark Yugi ' s monsters are : He puts " Torigun " on his left and the other four together in a square on his right . The game . Mokuba says that he will go first and comments that Dark Yugi ' s layout is like a beginner . Dark Yugi informs Mokuba that this will be a Shadow Game . Mokuba says that he knew that this game would be special , so he ' ll make sure to attack right away and moves " Gumbo " forward . Dark Yugi replies that he will meet him head on and moves " Eye Mouth " forward . Mokuba calls him stupid for coming at him with a low Level monsters and uses " Gumbo " to slice " Eye Mouth " in two , defeating it . " One down , four to go ! " , Mokuba laughs , but is surprised to find Dark Yugi laughing too . He asks why Dark Yugi is laughing , when he is the one who just lost a monster . Dark Yugi replies that he shall teach him the rules of gaming . Rule number 1 is that you must act like you have the upper hand , no matter what the circumstances . Disgusted , Mokuba asks if Dark Yugi thinks he can teach him . Dark Yugi points and says " Stay cool at all times is rule number 2 " . Dark Yugi makes his move . He decides to go on the offense and has " The Great " Pa " attack " Cobrada " . Both monsters are destroyed as they are the same Level . Even if he loses one monster , Mokuba says that he shall still defeat Yugi . Mokuba gets " Dinosaur Wing " to attack " Flower Man " , incinerating and defeating it . Dark Yugi moves " Devil Castle " to the left . However Mokuba easily beats it , having " Head Sucker " chomp it apart . Mokuba laughs that Dark Yugi is down to 1 monster , while Mokuba still has 4 . Dark Yugi laughs again and Mokuba asks why he is laughing again and if this is another " stupid rule " . However , Dark Yugi says that this time it is a laugh of victory . He diverts Mokuba ' s attention to the field , where Mokuba realizes that his monsters are now lined up diagonally . Dark Yugi ' s last monster is " Torigun " . It is low Level , cannot make sharp turns and is terrible at close combat . However , it has one special talent . Once per game , it can defeat any number of enemies in one diagonal super attack . Mokuba realizes that Dark Yugi had sacrificed his monsters , just to draw his into a line . " Torigun " uses its " Whirlwind Razor Beak Slash " attack to blast its way through all of Mokuba ' s remaining monsters . Aftermath . Dark Yugi holds up his finger and says " Hold your trump card ' till the end " is rule number three and advises Mokuba to remember it well . Dark Yugi inflicts Mokuba ' s Penalty Game , making Mokuba believe that a giant " CapMon " capsule has appeared over his head . Mokuba realizes that this is what made Seto go crazy . Before he becomes fully engulfed in the capsule , he warns Dark Yugi that Seto ' s revenge is coming soon ; project Death - T is underway . Dark Yugi wonders what Death - T could be and the capsule closes over Mokuba . Dark Yugi says that Mokuba is not a match for him and he should think about that while trapped inside the capsule . Mokuba ' s friends all gather around Mokuba , worrying about him , but are unable to see the capsule . Mokuba screams for his brother to help him . Dark Yugi walks away saying that they can play again later , when Mokuba has learned the rules . Appearances . Debuts are in bold . Anime adaption . Episode 11 : of the Toei " Yu - Gi - Oh ! " anime is based on this chapter . However rather than having Mokuba seeking revenge on Yugi , it contained Warashibe , who was hopelessly infatuated with Miho Nosaka . Warashibe challenged Miho to a game of " Capsule Monster Chess " in a similar location using a rigged dispenser . Warashibe got the same monsters as Mokuba did in the manga , while Miho got the same as Dark Yugi . After Miho realized Warashibe was cheating , she got up to leave . Warashibe tried to stop her by lowering a gate . However the gate broke and fell on Yugi and Miho . Dark Yugi emerged and continued the game with Warashibe . Dark Yugi defeated Warashibe in the same way he beat Mokuba in the manga .