Epic Quests

Epic Quests is a new feature released on the 4.6.1 update, being updated ever since. Acessed via the Travel Log, an epic quest is a multi-level quest that offers a unique reward when completed, which can varie from Coins, Gems to new plants. Although there are some exceptions, these levels are modified versions of existing ones, and cannot be replayed once completed unless the player plays on another account. At the moment it is unknown what unlocks them, but after one point a message saying New Epic Quest Available near the Travel Log access icon will appear, unlocking them. Currently there are four Epic Quests, with more being introduced in future updates.

Gem Jam
The first Epic Quest to appear on the game. Each step is an world exclusive Brain Buster except on the worlds where there isn't any. After completing all 10 steps, the player is rewarded with the second most cheap pack of gems, worth 50 gems.

Rescue the Gold Bloom
Unlocked after completion of Gem Jam (though the player may need to wait a while), this Epic Quest showcases the Gold Bloom, and offers it as a reward for its completion. Contrary to the Gem Jam quests, these ones are not restricted to be slightly altered brain busters, as portals and zombies from other worlds can appear.

Beghouled Blitz
Beghouled Blitz consists of 5 levels of Beghouled, each from a different world, with different plants.

Electrical Boogaloo
This Epic Quest is unlocked after the completion of the Beghouled Epic Quest. This Epic Quest has 10 steps, with many of them featuring the Electric Currant, which is also the reward after completing all ten steps of this Epic Quest.

Trivia

 * When doing the Beghouled Blitz Epic Quest, defeated zombies that have repeatable quest for that moment doesn't fill the meter.
 * The 4.8.1 is so far the only update that doesn't bring a new Epic Quest since their introduction.