The Shy Guy Co-Op Challenge is on in Mario Tennis Aces - NintendObserver
Yoshi's Ring Shot Co-op Challenge added in Mario Tennis Aces - NintendObserver
Mario Tennis Aces update 3.0 brings new mode, returning Co-Op challenge
Mario Tennis Aces - Shy Guy, Petey Piranha, Yoshi's Ring Shot Co-Op Challenge footage
Mario Tennis Aces having issue selecting Co-Op Challenge, will be fixed soon
Mario Tennis Aces 2.0 adds four new characters and a co-op challenge mode - Vooks
Mario Tennis Aces Update Adds Yoshi's Ring Shot Co-op Challenge And Online Tournament Doubles Class - Siliconera
Mario Tennis Aces - Co-op Challenge: Shy Guy Train Tussle - YouTube
Nintendo of America on Twitter: "Birdo! Shy Guy! Koopa Paratroopa! Petey Piranha! This motley crew will all join the game as playable characters in #MarioTennis Aces. The free Ver. 2.0 update on
Mario Tennis Aces July 2020 content update now available (rerun) | The GoNintendo Archives | GoNintendo
Mario Tennis Aces Gets New Characters and Co-op Challenges - GameRevolution
Mario Tennis Aces - Super Mario Wiki, the Mario encyclopedia
Boo Hunt Co-Op Challenge returning in Mario Tennis Aces - NintendObserver
Gameplay] NEW Co-op challenge: Boo Hunt! | Mario Tennis Aces - YouTube
Full Patch Notes For Mario Tennis Aces Version 2.3.0 – NintendoSoup