Like the previous installment, this game is a collaboration between Sega and Nintendo featuring characters from both the Mario series and the Sonic the Hedgehog series.
Although Sega was handling most of the development for both versions of this game, as it did for the original Mario & Sonic at the Olympic Games, they were also handling publishing/marketing duties for all territories outside of Japan, while Nintendo has done publishing/marketing duties for Japan itself.
The Wii version employs the Wii Remote controls, as well as the Wii Balance Board. The game features a Festival mode where the player starts from the opening to the closing ceremony. In the Festival mode, the player can choose to play an individual festival, where the player faces off against 7 other CPU characters, or a team festival, where the player can choose three other teammates to play.
New to the game is a marketplace that allows the player to purchase various items such as clothes and accessories for the player's Mii, tunes from both series, and customizable snowboards. Players can purchase these items using Star Tokens, which he/she earns based on his/her performance. Also, the gallery for Olympic trivia has now been replaced with the Library.
Also, all authentic (real-life based events) are unlocked from the start. Dream Events are in this game and all of them (excluding 2) need to be unlocked.
The aforementioned Festival Mode, is a special adventure mode where the participants must compete with some boss characters from the Mario and Sonic series in various events. Both the DS and the Wii versions take place in a place known as Christmas Village.
The DS version features Adventure Tours, a single player mode with a plot that involves Bowser and Dr. Eggman's scheme to melt all the snow by capturing the Snow Spirits. The Adventure Tour introduces one of the spirits called Frosty. Just as seen in the Wii version of the game, the DS rendition includes the introduction of boss characters appearing in the Adventure Tour mode. These bosses will be present in certain events where the player will have to compete against them to clear their missions. 
Also, all authentic (real-life based events) are unlocked from the start. Dream Events are in this game and all of them need to be unlocked.
All the main participants on the Wii character selection screen, including the Mii.All of the characters from the previous game, including Miis for the Wii version, return. There are also four new characters who were not present in Mario & Sonic at the Olympic Games. Retaining the first game's style, all playable characters are unlocked from the start (including new participants).
2 Chao (DS version, but only as scrubbers in curling)
It is possible to customize the outfit of the Miis in the game. Aside from differently colored suits, the Miis can also wear outfits that resemble the ones of the regular playable characters and a few bosses. For example, it is possible to give a Mii a Mario costume or an Amy costume. The player can buy equipment through the store in the game and unlike Mario & Sonic at the Olympic Games, the Miis' stats gets altered depending on the equipment they wear.
These characters only appear as cameos and tells the player that they've been watching the player in certain events. Pausing the game and hitting the when they're spotted gives the player 100 Star Points. The VIP members are:
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The single player mode for the Nintendo DS version of Mario & Sonic at the Olympic Winter Games has a set of Adventure Tours which revolve around a plot involving Bowser and Dr. Eggman's scheme to melt all the snow by capturing the Snow Spirits in Christmas Village.
Right after the gang defeat King Boo, Toad encounters Silver the Hedgehog and Blaze the Cat near a mission sign. The duo explains to Toad how they escaped and came to Polastraits. They tell Mario and Sonic they're going to join the team when they lose to them in a match of Ice Hockey when they get 1 point in the beginning.
However, devastated that they lost, they magically disappear. Toad is surprised about what happened. Later in Cubyrinth, Mario, Sonic and Toad encounter some strange Robo Balls at the beginning of the maze. Toad suggests they need to find Silver and Blaze again. Later in the same place, they find them again. Silver tells the trio that he and Blaze are sorry that they disappeared. Then he challenges the gang to a match of Fever Hockey when they receive 30 points in the beginning. Once the gang defeats the duo, they officially joins the group.
Toad then tells Silver about the robo balls. Silver helps the gang by stopping the Robo Balls with his physic powers within 15 seconds. He is later required to get Donkey Kong on the team in Icepeak. In the same location, Toad encounters a strange room with 4 blocks with the marks of Bowser, Eggman, Bowser Jr. and Metal Sonic. Blaze tells Toad that she will help them with the blocks in the correct places within 45 seconds. afterwards, a gate opens, leading the gang to a treasure chest with a Leader's Curling Stone inside. Later in Blizland, she is required to get Daisy to join the team.
When Mario, Sonic and Toad encounter a mysterious pole with a button on the top in Polastraits, Toad says that they need to look for a character who climbs a lot. Later in Icepeak, they find Donkey Kong crying due to one of his bananas fell in a deep ledge and he can't reach it. Silver then comes out and uses his physic powers to get the banana back to him. Donkey Kongs tells Silver thank you and challenges him to Moguls in order to join the party. When Silver finally defeats him, he joins the party.
Toad tells him that there's a pole back in Polastraits. There are also obstacles on the pole, such as ice and bombs. When the ape presses the button on the pole, in their amazement, a bridge forms.
In Cubyrinth, Vector the Crocodile is mentioned by Charmy when Mario, Sonic, and Toad run into him when the bee refused to let the trio get pass him. Toad then tells Charmy they will let him know when they see Vector.
Later in Icepeak, Vector is seen next to a mission sign. He tells the trio he will join the group if Donkey Kong defeats the music-loving crocodile in a match of Short Track 500m. Once Donkey Kong defeats Vector, he then joins the party.
Toad then tells Vector that Charmy needs to see him back in Cubyrinth. When they arrive in Cubyrinth, Charmy tells Vector in order to open the gate, he must engage in a quiz based on Real and Dream Winter Olympic sports and the islands of the snow spirits. He tells him if he gets 5 questions correct within 45 seconds, he will open the gate and let them through. Vector succeeds, and they go through.
Espio is seen when he tells his friend to let him know how many more whitestones are there in Sparkleton, Cubyrinth, and Blizland. When all the whitestones are found in those islands, he gets surprised that there's none left when the player collects all of them.
Princess Daisy is mentioned when Mario, Sonic, and Toad run into a Chao at Icepeak who when asked about the patch of Freezaleas says he "promised to show them to Princess Daisy". Toad comments on how they should let Daisy know if they run into her.
It is later in Blizland that Daisy is found practicing her Ultimate Figure Skating. When Toad questions whether or not Bowser and Eggman brought her there she mentions, "I was just doing some skating in Blizland, and Bowser and Eggman showed up. They started making a castle and a base, and now look at the place! Talk about an unpleasant surprise!". She then explains how she has been in hiding. When she see's the "entourage" of help Mario has gathered she spots Blaze and they strike up a conversation that leads to Daisy challenging Blaze to a round of Ultimate Figure Skating. The player is required to beat Daisy as Blaze.
After Toad mentions the Chao's Freezalea patch in Ice Peak, Daisy joins the group, she tells her friends she wants to go to Icepeak as quick as possible. When they arrive in Icepeak and Daisy is presented the Freezaleas from the Chao, she points out that she saw someone and Chao exclaims, "Kiki's going to destroy the flowers!". A stray Kiki begins wrecking the garden and Daisy is prompted to complete a mini-game to chase the monkey away. Daisy decides to try hitting the monkey with snowballs to stun him. However, Kiki is on the defensive mode by attacking her with snowballs. Afterwards, the Kiki runs away and in the process opens a previously sealed gate.
When Lakitu is encountered in Ice Peak, he mentions to Daisy that it would boost popularity of the missions he's in charge of if she were to compete in them. He also mentions that he will reward her the Meteor Curling Stone if she can complete the missions. The first mission objective is a Short Track event that must be completed in first place with no recovery zones. After completing it, Lakitu informs them to receive the reward, they will have to actually find the second mission and complete it as well.
The second mission is found much later in Blizland and it is an Intense Short Track event. In the event, Daisy is required to reach the goal without falling from the course. Once completed, Lakitu will offically give Daisy the Meteor Curling Stone.
Mario and Sonic encounter Wario and Waluigi in Polastraits. The duo tell them they need to defeat them in Bobsleigh in order to join the team. Once they defeat the duo, enraged, Wario and Waluigi begins to run toward the thin ice, create a hole on it, and then jump into the cold ocean. Toad is surprised to learn about it.
Much later in Icepeak, Toad finds Wario and Waluigi again. The duo tells them they were enraged because they lost. So they offer Mario and Sonic to defeat them in Snowboard Cross or else they will not join the team. Once Mario and Sonic defeat them, they officially join the team.
Later in Blizland, they encounter a Chain Chomp who is blocking the way. Wario decides to perform a Wario Waft to knock it off the platform. Once it gets knocked off the platform, the player proceeds there mission to save the Snow Sprits. Toad later runs into a Shy Guy to inform Waluigi about the secret location back in Cubyrinth. Once they get transported back there, Waluigi throws Bob-ombs at a Bomb Flapper. Afterwards, a hole forms and they discover a secret place with a lot of Shy Guys.
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Bowser's profile artwork is the same as his artwork for New Super Mario Bros. Wii, which came almost a month after this game.
An app based on this game was released for Apple's iPhone and iPod Touch, but only features Sonic characters and thus is named simply Sonic at the Olympic Winter Games. This game has since been removed from the AppStore.
This is currently only game in the series to be released on both consoles on the same day.