Mario & Sonic at the Olympic Games 2 (Xbox One)

Mario & Sonic at the Olympic Games 2 is an installment in the Mario & Sonic series. It was developed and published by Sega for the Xbox One.

Playable Characters
In total, there are 54 playable characters.

Mario Series

 * Mario
 * Luigi
 * Peach
 * Daisy
 * Bowser
 * Wario
 * Waluigi
 * Yoshi
 * Donkey Kong
 * Bowser Jr.

Guests

 * Nabbit (100m Sprint)
 * Toadette (4 x 100m Relay)
 * Rosalina (Gymnastics - Floor Exercise)
 * Pauline (Surfing)
 * Larry (Equestrian)
 * Diddy Kong (Rugby Sevens)
 * Birdo (Badminton)
 * Ludwig (Archery)

Sonic Series

 * Sonic
 * Tails
 * Knuckles
 * Amy
 * Dr. Eggman
 * Shadow
 * Silver
 * Metal Sonic
 * Blaze
 * Vector

Guests

 * Espio (Triple Jump)
 * Omega (Javelin Throw)
 * Rouge (100m Freestyle Swimming)
 * Eggman Nega (Canoe Sprint 1000m)
 * Zazz (Table Tennis)
 * Jet (Football)
 * Infinite (Karate)
 * Zavok (Boxing)

Rookies

 * Austin
 * Logan
 * Caleb R.
 * Brennan
 * Saben
 * Mikayla
 * Ellie
 * Katie
 * Olivia C.
 * Dani

Guests

 * Savannah (110m Hurdles)
 * Cyrus M. (Discus Throw)
 * Naomi (Uneven Bars)
 * Jake H. (Skateboarding)
 * Aaron (Sport Climbing)
 * Hailey S. (Beach Volleyball)
 * Drew O. (Fencing)
 * Zack (BMX)

Referees

 * Toad
 * Toadsworth
 * Lakitu
 * Cream
 * Charmy
 * Orbot
 * Cubot
 * Corden
 * Isabel

Crowd

 * Goomba
 * Koopa Troopa
 * Shy Guy
 * Toad
 * Chao
 * Hero Chao
 * Dark Chao
 * Omochao
 * Flicky
 * Porker
 * Tux
 * Chirp

Events
There are a total of 24 Olympic events. This time, each event comes with a Plus variant, similar to Rio.
 * 100m Sprint
 * 110m Hurdles
 * 4 x 100m Relay
 * Triple Jump
 * Discus Throw
 * Javelin Throw
 * Uneven Bars
 * Gymnastics - Floor Exercise
 * 100m Freestyle Swimming
 * Canoe Sprint 1000m
 * Surfing
 * Skateboarding
 * Sport Climbing
 * Equestrian
 * Table Tennis
 * Beach Volleyball
 * Football
 * Rugby Sevens
 * Badminton
 * Karate
 * Boxing
 * Fencing
 * Archery
 * BMX

Music
There are a total of 70 songs to unlock in the game, much less than the previous game.

Mario Series

 * Main Theme from Super Mario Bros.
 * Athletic Theme from Super Mario Bros. 3
 * Main Theme from Super Mario World
 * Main Theme from Super Mario 64
 * Delfino Plaza from Super Mario Sunshine
 * Athletic Theme from New Super Mario Bros.
 * Coconut Mall from Mario Kart Wii
 * Gusty Garden Galaxy from Super Mario Galaxy 
 * Mario Circuit from Mario Kart: Double Dash!!
 * Main Theme from New Super Mario Bros. Wii
 * Cheep Cheep Beach from Mario Kart DS
 * Fossil Falls from Super Mario Odyssey
 * Sky Station Galaxy from Super Mario Galaxy 2
 * Super Bell Hill from Super Mario 3D World
 * Underground Theme from Super Mario Land
 * Athletic Theme from Super Mario 3D Land
 * Rail Lift from Yoshi's Story
 * Boss Theme from Super Mario Sunshine
 * Mario Circuit from Mario Kart 8
 * Athletic Theme from New Super Mario Bros. 2
 * Dino Piranha from Super Mario Galaxy
 * Main Theme from Super Mario Land 2: 6 Golden Coins
 * Peach Beach from Mario Kart: Double Dash!!
 * Main Theme from New Super Mario Bros. U (Nabbit's Theme)
 * Slide from Super Mario 64 (Toadette's Theme)
 * Comet Observatory from Super Mario Galaxy (Rosalina's Theme)
 * Jump Up, Super Star! from Super Mario Odyssey (Pauline's Theme)
 * Boss Theme from New Super Mario Bros. Wii (Larry's Theme)
 * DK Island Swing from Donkey Kong Country (Diddy Kong's Theme)
 * Main Theme from Super Mario Bros. 2 (Birdo's Theme)
 * A Boy and his Ludship from Paper Mario: Color Splash (Ludwig's Theme)
 * Daisy Circuit from Mario Kart Wii (Savannah's Theme)
 * Yoshi Star Galaxy from Super Mario Galaxy 2 (Naomi's Theme)
 * Coincentration from Super Mario 64 DS (Aaron's Theme)
 * Rock Rock Mountain from Mario Kart 7 (Zack's Theme)

Sonic Series

 * Rooftop Run - Day from Sonic Unleashed
 * Angel Island from Sonic the Hedgehog 3
 * City Escape from Sonic Adventure 2
 * Windy Valley from Sonic Adventure
 * Right There, Ride On from Sonic Rush
 * Palmtree Panic from Sonic CD
 * Seaside Hill from Sonic Heroes
 * Flying Battery from Sonic and Knuckles
 * A New Venture from Sonic Rush Adventure
 * Let the Speed Mend It from Sonic and the Secret Rings
 * Reach for the Stars from Sonic Colors
 * His World from Sonic the Hedgehog (2006)
 * Misty Lake from Sonic and the Black Knight
 * Green Hill from Sonic the Hedgehog
 * Studiopolis from Sonic Mania
 * Fist Bump from Sonic Forces
 * Windy Hill from Sonic Lost World
 * Metropolis from Sonic the Hedgehog 2
 * Planet Wisp from Sonic Colors
 * Trap Tower from Sonic Mania Plus
 * Un-gravitify from Sonic Riders: Zero Gravity
 * Carnival Night from Sonic the Hedgehog 3
 * Wisp Circuit from Team Sonic Racing
 * Balloon Park from Sonic the Hedgehog 3 (Espio's Theme)
 * This Machine from Sonic Heroes (Omega's Theme)
 * Security Hall from Sonic Adventure 2 (Rouge's Theme)
 * Metal Scratchin' from Sonic Rush (Eggman Nega's Theme)
 * The Deadly Six from Sonic Lost World (Zazz's Theme)
 * Babylon Garden from Sonic Riders (Jet's Theme)
 * Infinite from Sonic Forces (Infinite's Theme)
 * Boss Rush from Sonic Lost World (Zavok's Theme)
 * Crazy Gadget from Sonic Adventure 2 (Cyrus M.'s Theme)
 * Sky Rail from Sonic Adventure 2 (Jake H.'s Theme)
 * Splash Hill from Sonic the Hedgehog 4, Episode 1 (Hailey S.'s Theme)
 * Capital City from Sonic Forces (Drew O.'s Theme)