Lava

In levels 3, 5, 7, & 10, there is lava [P1]. If you touch the lava, you die. The lava makes the game harder because you have to keep going, and you can't jump on the same platform twice.
Color:
The color is the same as the bottom platform in normal and reverse mode.

History:
Lava was added in Beta 1.1.3 and hasn't changed since.