Sheldon Licenses

Sheldon Licenses are used instead of the usual cash to buy weapons at Ammo Knights in Splatoon 3. if you ask to buy a weapon higher than your recommended level, Sheldon will state that that weapon is "a little too spicy for you." But if you give him three Sheldon Licenses instead of one, you can buy the weapon regardless of level.

Gold Sheldon licences

Gold Sheldon Licences can be obtained by transferring a Splatoon 2 account into Splatoon 3 and can be given to Sheldon to buy a weapon no matter what its recommended level is for just one Gold Sheldon License