Smiley Blocks Stacker is an interesting matching game unblocked. It's free to play by yourself with lots of puzzles. Especially, you need to prevent blocks from filling up the screen. Otherwise, you will lose and cannot reach the end of Smiley Blocks Stacker online. So, you must remove those items before they occupy the entire playfield. Don't worry! The guide will show you what you can do. Besides, you are able to pick the difficulty you love to challenge your mouse skills. Much fun!