Drop Stacks

Game Description
The goal of Drop Stacks is to eliminate all tiles from the grid using the given directional tiles. Each level contains a limited number of directional tiles. You must decide how to best use the the tiles to win the level.
How to Play
Click or tap a directional tile and place it on the grid. All tiles in that row, column, or diagonal will be removed from the board. Tap the hint button when you need some help but use the clues sparingly. Reset the level to begin again.
Tags
puzzle, geometry, logic
Skills
problem solving, perseverence, handling complexity, trial and error, testing ideas, spatial reasoning