This completely Forge-able layer, accessed via teleporters, is outlined by a blue grid (which is exactly what the Edge acceptance video was hinting at). The difference between it and the Sandbox ground floor is that the open areas are considered abysses. Folks who should take a wrong step will find themselves falling, falling, falling to their deaths. Both the Sky Bubble and Sandbox planes are playable at the same time, so snipers are sure to have a lovely time.
Fanatical Halo 3 Forgers will have a creative hay-day with the new Sky Bubble option ... but us? We just have an itch to create a floating game of Scrabble. Double word score is located high above the rocket spawn.
[Thanks, StLouisRibs7734]
