Splatoon 2 Special Demo
From Inkipedia, the Splatoon wiki
The Splatoon 2 Special Demo was a free Splatoon 2 demo available on the Nintendo eShop. Similar to Splatoon 2 Global Testfire and Splatoon 2 Splatfest World Premiere Demo, it allowed players to engage in free four-on-four Turf War with other players who own the full game, with an addition of Salmon Run and Ranked Battle, at scheduled times. Players who downloaded the demo receives a 7-day free trial for Nintendo Switch Online. Progress from the Special Demo can be transferred to the full game.