Hello, fellow coder! Are you ready to tackle an exciting coding challenge using Kotlin? In this lesson, we're going to explore unique methods for traversing matrices. Matrices in Kotlin are represented as 2D arrays where each inner array maintains the same size. We'll perform a traversal through these matrices by moving up and down across columns, creating a zigzag pattern as we go. Sounds intriguing? Let's get started!

Here's your task: Given a 2D array where each element holds a unique integer value, your goal is to develop a function that traverses the matrix starting from the bottom-right cell. From there, you'll travel upwards to the top of the same column, then move left to the next column, and begin moving downward from the top of this new column. Continue this pattern of traversal until all cells have been visited.

Consider this small 3x4 matrix as an example:

Using the described traversal pattern, your function should return this list: [12, 8, 4, 3, 7, 11, 10, 6, 2, 1, 5, 9].

To begin our solution, we need to determine the dimensions of our matrix. We'll accomplish this using Kotlin's array properties. Let's start by setting up our function and identifying the matrix size: