Barrage a Trois

Difficulty: Hard-very hard

Barrage a Trois is an achievement in Plants vs. Zombies 2. It is achieved by beating Frostbite Caves - Day 16. It is worth 20 points on Game Center for iOS devices and worth 2,000 XP on Google Play for Android devices.

Strategies
See Frostbite Caves, Frostbite Caves - Day 16, and Frostbite Caves/Walkthrough.

Trivia

 * Its name is a play on 'menage a trois', which slightly means 'barrier of three' in French.
 * It could also be a nod to the fact that the Sloth Gargantuar barrages the player with three Yeti Imps.