Super Mario Bros. 35's first collaborative event has ended, and it was a success. The event tasked players with cumulatively defeating 3.5 million Bowsers, and they exceeded that goal, defeating 5,363,696 Bowsers in total.
As a reward for surpassing the event goal, everyone who participated and defeated at least one Bowser during the event will receive 350 Platinum points in their My Nintendo account. These points can be redeemed for rewards on the My Nintendo website, including various physical items like the recently added Splatoon 2 Mario keychain set (although that is temporarily out of stock).
Nintendo plans to hold two more World Count Challenge events in February and March. Details about those have not been announced yet, however.
Super Mario Bros. 35 released back in October as part of Nintendo's Super Mario 35th anniversary celebration, and it's free to download and play exclusively for Nintendo Switch Online subscribers. However, much like Super Mario 3D All-Stars, the game is a limited-time release; it will only be available until March 31.