World 10 (Dr. Mario World)
World 10 is a snow-themed world in Dr. Mario World. The first area is available as of 1 AM PT on Dec. 12, 2019, delayed from the scheduled date at 11 PM PT on Dec. 11, 2019, while the second area, challenge stages and special stage are available as of 1 AM PT on Dec. 26, 2019.
When the areas are cleared, Penguins and Ice Bros appear. The viruses featured in the regular stages are red, blue and green, while in the challenge stages, the featured viruses are green, light-blue and pink.