Ah yes, this would be kind of confusing in that case :) Simply put, it's to move the blue-greenish block off the right side of the grid. You clear the path by

Ah yes, this would be kind of confusing in that case :) Simply put, it's to move the blue-greenish block off the right side of the grid. You clear the path by moving all the other pieces around as necessary. Each piece can only slide horizontally or vertically, depending on its orientation (they move along their longer dimension).