Unexpected

Within a set space, there was an arrangement of vertical and horizontal blocks with one opening. Among those blocks, there was a single one that had to be pushed out of the opening in order to complete the puzzle.

However, the difficulty of the game came because every block seemed to have the sole purpose of stopping you from sliding that penultimate block out of the opening. In addition, each block had access to only one-dimensional movement. Meaning, you could only move a given block either left or right, or up and down.

The worst part was that this array took this difficulty to a whole other level. For one, instead of a simple and straight forward sliding of the block by pushing or pulling, all movements were dictated by the pattern of movement a person trapped in the array executed. And to make it worse, the patterns of movement became convoluted because the array was constantly making you go left when you wanted to go right, or up when you wanted to go down.