https://www.cnet.com/news/you-can-try-mario-tennis-aces-on-nintendo-switch-early-for-free/

Nintendo announced Tuesday that its prelaunch demo event will run from June 1 at 6 p.m. PT through June 3 at 11:59 p.m. PT.

During that event, players can download and play a version of Mario Tennis Aces as part of an online tournament.