Yo-kai Watch 4++ details multiplayer mode, new quests, and more new yo-kai - Gematsu

Level-5 has released new information and screenshots for Yo-kai Watch 4++, its enhanced version of the original game, introducing the game’s multiplayer mode, new quests, and new yo-kai.

Yo-kai Watch 4 - Part 14: WHISPER Quest & More! (Post-Game)

Yo-kai Watch 4++ Re-release/Paid Update Announced for December 5 Release, Details Inside : r/yokaiwatch

Yo-kai Watch 4 and Yo-kai Watch 4++: Software updates (latest: Ver. 2.2.0) - Perfectly Nintendo

Yo-kai Watch 4++ Update - NEW DLC, NEW Yo-kai, & MORE!

Yo-kai Watch 4++ Update - NEW DLC, NEW Yo-kai, & MORE!

Cadin's Cave on Tumblr

YO-KAI WATCH 4 DLC ANNOUNCED! Multiplayer, New Yo-kai and More!

Yo-kai Watch 3, Yo-kai Watch Wiki

News - January, 2019

Yo-kai Watch 4++ opening movie - Gematsu

Yo-kai Watch 4 details GeGeGe no Kitaro side quest, gacha machines, character growth, and yo-kai befriending system - Gematsu

Level-5 Shares More Info About Yo-kai Watch 4++ New Quests, Yo-kais, & Multiplayer Mode – NintendoSoup

Level-5 Showcasing New IP & More In Upcoming March Live Stream

Shueisha Games, Discussion Thread

Kingdom expansion