Plants vs. Zombies: Battle of Both Sides/Ultimate Survival

Ultimate Survival is a special endless zone that is set in the backyard of Plants vs. Zombies: Battle of Both Sides. Every zombie will appear here. Unlike other endless zones, Ultimate Survival functions like the Endless Zone of PvZ1, but with a new twist: every 10 flags, it switches from daytime to nighttime, and vise versa. It is unlocked after beating Zomboss' Mansion.
== Music ==
Choose Your Seeds
Main Theme 1 (Day)
Main Theme 2 (Night)
(The boss theme is the same depending on which boss is there)
==Trivia==
*This is the only Endless Zone that functions differently than others.
*Unlike PvZ1, non-amphibious zombies can also appear in water.
*Every 50 flags, a random boss in the game will appear and fight the player. They retain their main attacks in their areas, but they summon random zombies.
** The player can see the boss entering the lawn during the seed-selection screen.
**No other zombies will appear when there is a boss.
*This is the only area with 2 main themes.
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