UPIXO in Action: Mission in Snowdriftland (or simply Mission in Snowdriftland) is a Flash-based platform game created by German studio Tons of Bits (formaly Extra Toxic), with help from Nintendo. Doubling as a game and an advent calendar advertising different Nintendo products. The game was available only accessible in December of 2006 and a re-release in December of 2010 before being restored and remastered for a Steam release in 2021 without Nintendo’s advertising, with the developers also possibly creating a Nintendo Switch port of the game in the future.
https://www.mission-in-snowdriftland.com/