Classic Mode Tickets are tickets that can be used in Classic Mode. They can be collected through playing Classic Mode or the shop.
Origin
Classic Mode tickets first appeared in Super Smash Bros. Ultimate, they can be used to prevent using coins to continue and prevent the intensity going down after failing a round. After using a Classic Mode Ticket, the difficulty will no longer be able to increase to 9.9, but if the intensity is already there, they will not have an effect.