BeSlimed borrows its puzzle gameplay from the very popular Bejeweled games by PopCap, so if you like Bejeweled, you'll probably like this one as well. You clear groups of identical "blobs" (gems in the original game) by swapping one blob with an adjacent to form horizontal or vertical lines of 3 or more identical blobs. The group is cleared and the blobs above fall down (and new ones enter the field from the top) sometimes creating chain reactions. The more blobs you clear, the more points.

As you progress, the variety of blob types will increase, making it harder and harder to find valid groups. A timer makes sure you can't relax for long. The game, which was built with MooTools, is well done and looks very professional.