Job 38: Invasion of the Kars
A story mode for this game, since all switch sport games have a sort of story mode I belive this one should have it too.
This Story starts with Mario and Co racing a race track, Consisting of Mario, Luigi, Peach, Daisy, Bowser Jr, Wario, Bowser, King Boo, Paunline, Dk, Diddy, and Waluigi, after some mishaps Waluigi got wrecked into last place and fell into a ditch, however at the award ceremony the other 11 players got abducted by aliens called the Kars, a race of robots that want to steal the skills of the 11 players and use then to power a super weapon called the Doom Buggy, a car that goes so fast it could risk shredding the spacetime continuem, to do this they converted the 11 kidnapped racers and turned them into robots called the PITT CREW led by the leader of the Kars, King Deisel, and they take the essence of those 11 racers and use them to power the PITT CREW causing the abducted to turn to stone, luckily Waluigi was all safe and sound and decided to go one a quest to stop the PITT CREW and defeat King Deisel to gain all sorts of recognition and become the guy who defeated the Kars.
As Waluigi your mission is too travel to each of the 12 hubworlds, each hubworld has a member of the PITT CREW all modeled after a specific racer, each section of the 12 induvidual hubs contain 4 distinct sections each blocked off by a gate of a currency called Motor Medals, you collect Motor Medals by completing various types of missions and the amount you get is determined by the toughness of the mission (2 Medals for Easy level missions, 4 for Medium level missions, 6 for Hard level missions and 8 for Legendary legend missions) plus an extra Medal for completing an optional challenge the mission gives, in the middle of each Hubwolrd is a boss level you must complete against a monster under the PITT CREW's control, after you defeat that you unlock access to the next 2 segments of the Hub before needing to unlock the key to the race against the specific member of the PITT CREW to access the next Hubworld. There are also npcs you can talk too that can give you remixed missions of the ones you completed un exchange for more Medals, this makes the structure very open ended like Super Mario 64. The missions types include:
Race to the Top: Race to first place against some Kars
Target Test: Destroy the Targets using items such as the Fire Flower.
Color Chain: A three lap course where you have to break all the boxes of a specific color for the first lap, then do the same for the second lap only a different color, then again, think of the spyro speedways.
Silver Coin Ralley: Find all 5 silver coins in a track and get to the top 3.
Dont Touch It: Go though a traditional race without not touching anything the challenge specifies and get to the top 3.
Balloon Battle: Do the balloon battle mode against the Kars
Derby Rush: Destroy all the enemy cars in a arena
Ordeal: Face a boss battle unique to each world
PITT POW: 1 ON 1 race with the PITT CREW
Minigame: Unique missions that are unique to each world.
Aside from Motor Medals you gain two other currencies, Bolts and Ministars.
Bolts can be traded to Funky Kong to create new parts for your car to better increase your stats and handling, the stats are changed to be more noticable so that switching parts can be more important for different tracks. Bolt can be collected the same way as coins and they infect replace coins on the track, each mission even if there on the same track has a different structure of Bolts so finding which track is best for Bolt Grinding is key.
Aside from Motor Medals when completing missions you get Mini Stars, originating from Mario Party 9, these items can be used by E Gadd to fill out a skill tree to give you special abilities that arnt available in normal racing, these include a magnet that attracts Bolts, extra powerful collision, or having an item at the start of a race, the better at these missions you are the more mini stars you collect.
Again there are 12 worlds each holding a member of the PITT CREW as challengers, and they have made each area they are in guarded by both a member of the PITT CREW and a boss monster from across all mario timelines that act as gatekeepers for the middle of the hubworlds: (note you didnt say when you mean locations you mean tracks or hub worlds so I'm just describing the hub worlds and not the tracks that are in them)
Raceway Town: the first sighting of the Kars, a simple pitstop town surrounded by equally basic raceways, the tutorial area of the game, Luigi-Unit is the challenger you face and his Chain Complets trio act a the boss you need to take down.
Whitecomb Beach: A silky smooth white sand beach populated by piantas and nokis, it's usually peaceful but both Diddy-Unit and Glooper Blooper have caused some ruckus and need to be stopped.
Blossom Palace: A japanese inspired town with giant pagodas, cherry blossom trees, and a double whammy of Torkdrift and Peach-Unit.
Cold Cold Berg: A giant iceberg research station with a hidden ice temple inside, DK-Unit cause the gaurdian Bonechill to freeze all the Koopa scientists.
Matterhouse Mansion: A spooky pumpkin patch dominated by a confusingly layout of a mansiom, King Boo-Unit has managed to summon a Phantamanta as his personal gaurd dog.
Diamond Arcade: A giant arcade machine factory owned by Warioware inc, now Wario-Unit and a giant Mechakoopa have claimed it themselves.
Tangerine Grill: A tropical restaurant barbecue establishment owned by some friendly goombas, they have been terrorised by Diasy Unit and Mugly
Candystripe Park: A popular amusement park in the sky featuring a candy rollercoaster and a chocolate river, is the main hub of Pauline-Unit and Wingo.
Cloudstone Moutain: A literal castle in the sky owned by Bowser Jr-Unit that is protected by Fracktail the gaurdian of the sky.
Mt.Red: Bowser-Units and Boss Brolder's giant firey battleship located in a active volcano.
Cosmic Skyway: Mario-Unit is the master of this dangerous spaceship hub, with some assistance of his gaurdian Tryclyde.
Diesel's Domain: This mechanical fortess in the home of King Diesel, the master of the Kars, his great mecha tanks are his Kars elite.
(Note again you dint need to use these hubworlds if you want take them but I thought it would flesh out the adveture.)
After defeating King Diesel you find out that all he wanted was friends to race as his planet outlawed racing, so Waluigi forgives him and allows him to race with his friends at any time as long as they dont abduct them anymore. then Waluigi is celebrated as the hero of the Grand Prix and you unlock the DX mode which gives harder versions of previously completed missions and bosses.
So yeah very detailed for a single player mode, hopefully lots of people can enjoy this as well.