After Jet wishes Luigi and Tails luck on their mission, the two go around to find someone with more passes so that they can get into more venues. On the search, they go to the Tokyo Metropolitan Government Building, where they happen to find Donkey Kong, who explains that he is there because he wants to see the view from the top of the government building, but that Metal Sonic and a group of Egg Pawns are in the way. After Luigi asks him if he has an entry pass, he reveals that he has a pass for Makuhari Messe Hall B, and when he asks why it is needed, Luigi explains the situation to him. Tails strikes a deal with Donkey Kong that he and Luigi will deal with the robots and, in return, Donkey Kong will give him the pass, and Donkey Kong accepts. Fulfilling his promise, Luigi uses his rugby skills to deal with the Egg Pawns on the ground and strike Metal Sonic, who is flying in the air above the building. After Luigi deals with them, Donkey Kong happily gives the two heroes his pass as he promised, and he also decides to join them because he thinks that watching them compete in events will be fun, deciding to go to the observatory later. The group goes to Makuhari Messe Hall B, where they find another Koopaling, Ludwig, who has been told by Larry that Luigi and Tails stole the Magikoopa's battery from Larry, so he has a grudge against them. Tails explains the truth to Ludwig, and Luigi brings out the Excitement Battery to show him, an action Ludwig uses as an opportunity to steal it from them and throw it to Wendy, who successfully catches it. The two Koopalings keep the battery for themselves to give back to Larry, until Ludwig gets the idea to have a competition for the battery, stating that whoever wins gets to be the owner of it. Waluigi accepts Ludwig's challenge, wanting to compete in order to obtain both the Excitement Battery and a gold medal. Ludwig likes Waluigi's attitude, and the two of them go against each other in Fencing. However, just like Wendy and Larry before him, Ludwig ends up losing the match. While Wendy is belittling her older brother, she takes out the battery. The battery begins glowing, which scares her, causing her to accidentally throw it in the air. Luigi catches the battery, and it charges up even more. After learning how the battery works from Tails, the two Koopalings let Luigi and Tails keep it since Wendy does not want to do work while Ludwig does not want to get involved in anything that he considers weird, and they both leave.
While walking around to find someone with more venue passes, Luigi and Tails find Blaze at the Kabukiza Theatre, where she was intending to watch a Kabuki play between Olympic Events but found that the entrance was being guarded by a group of Egg Pawns. She explains that she wanted to use her fire powers to destroy them but worried that she would set the theatre on fire as well. Luigi asks for an entry pass from her, and she reveals that she has one for Tsurigasaki Surfing Beach, so Tails sets a deal that he can clear the Egg Pawns if Blaze gives the venue pass she has, which she accepts. Tails shoots down all of the Egg Pawns with a bow and arrow, and Blaze gives him and Luigi the pass as promised. Tails offers for Blaze to join the party, and she accepts in order to help save Mario and Sonic. The heroes then go to Tsurigasaki Surfing Beach, where they find Rosalina, who is aware of the activities that Luigi and Tails are engaging in. To help them charge the battery, Rosalina decides to hold a Surfing competition to get the crowd cheering. Donkey Kong is reminded of his own island upon seeing the ocean, and Rosalina asks if he wants to be in her competition, which he accepts. After he beats her in the competition, the battery becomes fully charged, allowing it to be used without ever recharging it.
Taking on Bowser and Dr. Eggman's challenge in the Marathon, Mario and Sonic go to the National Stadium to meet them. There, they find many competitors who are running in the big race, including Toads, animals, and Hammer Bros., and Toad is present as well. When Bowser and Dr. Eggman find the heroes, Bowser begins gloating about how this event requires a lot of stamina to win, which is what he has. Mario decides to partake in the race with his arch-nemesis to win the gold medal. A nearby Flicky lets everyone know that the race is beginning, and Mario and Bowser go to face off against each other. Mario successfully beats not only Bowser but also the 66 other competitors in the race. Bowser is angry at this result, but Dr. Eggman reminds him that they can still initiate their secret plan, which involves knocking out Mario and Sonic and stealing their gold medals. Bowser manages to do the former, but when he attempts the latter, he realizes that they do not have their gold medals. Toad reveals that he was the one holding on to their medals and gives them to Sonic after he and Mario wake up, stating they did not use just stamina but their brains as well. While Dr. Eggman tries to come up with a new plan, Sonic reminds him that they do not have much time left because of the battery, with Mario following up, saying that they should team up to get out. After Bowser and Dr. Eggman discuss how they can simply have a showdown when they return to the real world, they agree with Mario and Sonic. The five characters go to the Olympic Cauldron and place all of the gold medals into the keyholes. Initially, nothing happens, but then the medals begin to glow and everything around them starts shaking. A beam of light shines from the sky onto the flame that will take the characters back to the real world, but while this is happening, everything around them begins to flicker again. Dr. Eggman realizes that the battery has finally run out, stating that their mission was a failure despite them being so close to the goal. 2b1af7f3a8