Cash is the main currency in the Splatoon series. 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 they see in Inkopolis Plaza, Inkopolis Square, or Splatsville 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. In Splatoon 3, weapons are no longer purchased with cash, but instead with Sheldon Licenses. However, Splatoon 3 introduces the ability to purchase decorations from Hotlantis and to try your luck for various prizes with the Shell-Out Machine.
Cash can be obtained by completing multiplayer battles (both Regular Battles and Ranked Battles), completing Salmon Run shifts, using the vending machine in the Deepsea Metro, using the Shel-drone, talking to Judd with a great enough vibe (only in Splatoon), or winning amiibo challenges (also only in Splatoon). With each stage rotation in Splatoon, the player can 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 (only in Splatoon 2). The Octo Expansion also has 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. Return of the Mammalians uses Power Eggs in a similar manner, with the player able to use the Shel-drone once per day.
The number of coins earned after a battle directly translates from the number of points gained and can be increased using tickets. These multiply the coins earned by 1.5×, 2.0×, or 2.5×. For example, if a player under the effect of a 2.5× coin ticket inks 872 points of turf during a Turf War match and wins the battle, adding an extra 1,000 points, they will earn 4,680 coins. In Splatoon 3, 2.5× tickets are replaced with smorgasbord tickets that give a 2.0× bonus to every member of the player's team in each match it is active for; the effects of multiple tickets do not stack.
In Ranked Battles and Anarchy Battles, the number of coins is directly linked to the number of points obtained by the team. Additionally, a 3,000 coin bonus is granted for a victory. For example, if a player wins a match with a knockout, they will get 500 coins for the points and 3,000 coins for the victory.
- Some Sunken Scrolls and UI elements refer to cash as "G", which may imply that the arrow design is a stylised letter G. In Nintendo Badge Arcade, there is a badge of the coin called 'ゲソコイン' (geso coin). 'Geso' means squid tentacle. The currency is also referred to as 'ゲソ' (geso) in Japanese throughout Badge prerequisites in Splatoon 3. This implies it is the actual name of the currency in Japanese.
- 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.
In shops such as Ammo Knights, Cash can be used to purchase gear and weapons.
The Crust Bucket food menu. the food selected increases battle cash earned by 150%.
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