Shell on Wheels

Difficulty: Very Easy

Shell on Wheels is an achievement in Plants vs. Zombies 2: It's About Time. It requires the player to place a Wall-nut on a mine cart. It is worth five points.

Strategies
Having a Wall-nut in a minecart not only unlocks Shell on Wheels, but it also is highly practical. Having it there allows the player to share a Wall-nut across multiple lanes. This is especially helpful with Wall-nut First Aid and Plant Food when the Wall-nut has low health, or using the higher health of a Tall-nut instead.

Trivia

 * Shell on Wheels is a reference to "Hell on Wheels," a western TV series based upon a former Confederate soldier's life in the Western United States after the events of the American Civil War.
 * Playing Wild West's Save Our Seeds levels does not count towards the achievement.
 * This is due to the Wall-nuts already automatically being there, and weren't actually placed.