Board Thread:Plants vs. Zombies 2/@comment-24760547-20151117123559/@comment-24203813-20151117201224

Gimmick idea:

The time of day changes throughout the level. It starts out very early morning, with night mechanics. As the level progresses it'll turn to morning, where sun falls from sky less quickly, normal day, evening (which is the same as morning), and then night as fog rolls in and graves rise from the ground.

Of course, this is a creative gimmick idea, and popcap are most likely not going to use anything like it.