Today during the Nintendo Direct dedicated to the fighting game Arms, Nintendo announced new details about the fighting game and also revealed that a free demo is coming soon.
The Global Testpunch Demo, as it is called, will follow a similar model to the demos for Splatoon and Splatoon 2, which is to say they might not be all that convenient for you. The demos will be available at "blocks of time" through the weekend of May 26-28 and again on June 2-4. You need only download the free demo from the eShop to get in, while specific timing of the demo periods will be announced later. The Splatoon 2 beta was held for one-hour periods, repeating throughout the weekend.
Arms was developed by "many" of the same people at Nintendo who worked on Mario Kart 8 Deluxe, the company said in a press release. Players can expect "the same level of polish and competitive action" in Arms as Mario Kart 8, according to Nintendo.