No need to change cartridges. You can jump directly into a fight.
: The game is available as a standalone digital download or as part of the Naruto: Ultimate Ninja Storm Trilogy (approximately 17.6 GB total). Naruto- Ultimate Ninja Storm Switch NSP -eShop-
A: No, each game has its own separate save file. The trilogy is a collection of three independent games, not a single continuous RPG. No need to change cartridges
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