The Floor is Lava! (Unabridged‪)‬

As Emma and Noah Miller return home after playing in the backyard, they realize that the floor is suddenly covered in lava! The siblings must venture throughout the house, which has transformed into a mountain, without touching the ground once. And the only way to return the floor to normal sits at the top of the mountain, which they must reach before everything is covered in the hot, bubbling lava. But time is running out fast!