Yo-kai Watch 4++ is an updated version of Yo-kai Watch 4 with new content for the game, there will be new areas like "Blossom Heights" and “Cauldron-Boiled Hell”, a new Yo-kai to befriend, a new boss and a new multiplayer mode.
Yo-kai Watch 4++ (2019)
Yo-kai Watch - Wikipedia
Yo-kai Watch 4 - WHF '19 Trailer & Gameplay + HIDDEN DETAILS (Nintendo Switch)
Yo-kai Watch 4++ announced for PS4 and Nintendo Switch in Japan - LootPots
Yo-Kai Watch 4 – NintendoSoup
Level 5 เปิดตัว Yo-Kai Watch 4++ - เกมถูกบอกด้วย v.2
Yo-kai Watch 4 - Metacritic
Yo-kai Watch: Shadowside (TV) - Anime News Network
Yo-kai Watch 4, Yo-kai Watch Wiki