Cash is the main multiplayer currency in Splatoon and Splatoon 2. It is mainly used to purchase gear, such as weapons or clothing, from the shops in Booyah Base and the Galleria. Spyke and Murch have different services that require cash, such as rerolling abilities and scrubbing secondary ability slots. Players can also order gear that other players in their Inkopolis Plaza or Inkopolis Square are wearing and can pick it up the next day from Spyke or Murch at a price that depends on the rarity of the gear and the number of unlocked slots on it. Cash can be obtained through multiplayer battles such as Turf War and Ranked Battle, through Salmon Run, from the vending machine in Deepsea Metro, from Judd for the player's vibe in Splatoon, as well as through winning amiibo challenges in Splatoon.
With each stage rotation in Splatoon, the player is able to turn in their vibe points earned via online battles to Judd in Inkopolis Plaza for a cash bonus. Gear bought with Cash can only be used in multiplayer battles. Octo Valley and Octo Canyon have their own Power Egg currency that is used to unlock or upgrade gear and weapons as well as purchase drink tickets after all upgrades are unlocked in Splatoon 2. The Octo Expansion also has its own currency in the form of CQ Points, which can be used to enter test stations and get items and cash from the vending machine that becomes available once the player returns to Deepsea Metro after completing the story of the expansion.
The number of coins earned after a battle can be increased using Crust Bucket Tickets. These tickets multiply the coins earned by 1.5x, 2.0x or 2.5x. For example, if a player under the effect of a 2.5x coin ticket inks 872 points of turf during a Turf War match and wins the battle, they will earn 4,680 coins.
- Some Sunken Scrolls refer to Cash as "G", which may imply that the arrow design is a stylised letter G.
- In Splatoon, purchasing every piece of equipment and filling all slots in all pieces of gear without using Super Sea Snails takes a total of 10,885,800.
- In Splatoon 2, purchasing every piece of equipment takes a total of 3,575,917.
- In Mario Kart 8 Deluxe, when battling on Urchin Underpass in Coin Runners or Renegade Roundup, the standard Mario coins are replaced with Cash.
The Crust Bucket food menu, the food selected increases battle cash earned by 150%.
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