Because the level 5-10 (for Roof) and all of the Night Roof levels (from the Level 6-1 to the Level 6-10) are not appeared for the Plants vs. Zombies game. And why, if Trash Can Zombies, Fisherman Zombies, Giga Football Zombies, and Giga Gargantuars are not have to be appeared on the Night Roof levels in Plants vs. Zombies game.
This is the article about the things for the Plants vs. Zombies game, and they do not allowed in the updated version of Plants vs. Zombies game.
