Blobble uses the same colorful eye-candy that Iccursion games have developed a reputation for. The game pieces are made up of the standard rainbow hues, along with a small array of special pieces. Pipes decorate the exterior of the game screen and everything flows together nicely.
The goal of the game is to clump together as many blobs of the same color as you can. When you drop a new blob onto a pile of same-color blobs, you get points based on how many blobs are in that group. Larger groups give you more points, but since you're taking turns with your opponent, if they drop a same-color blob onto the same pile after you do, they'll get more points than you, so watch out!
As you play, you'll be provided with a random assortment of blobs to work with, and you must drop one of these from the top each turn. Typically these are selected from the six main colors, with yellows being the most common and reds being rare, but sometimes there will be one of several special pieces thrown into the mix. These pieces might change the colors of the blobs where they land, give the player a free turn (I'll explain why that's important in a moment), or smash a hole in the playing area to give everyone more space to work with.
Throughout the play area there are several special tiles, which provide free turns, special pieces, double or even tripple scores. Naturally, when you've got a hefty pile of blobs and you want to drop another blob onto the pile for big points, you'll want to be making your way towards the double or tripple score tiles. Just be careful, because if you put those tiles within reach, you're taking the chance that your opponent can steal that treasure load of points from you. This is where one of those special pieces comes in handy; the free turn piece. You drop a free turn piece below a score multiplier tile, and then you have an extra turn to drop your piece on the tile and get the bonus without giving your opponent a chance to steal it from you!
As stated earlier, Blobble now allows for a single player to player against the computer. How does the computer stand up against a human player? The computer comes in two levels of difficulty, easy or hard. Easy is competitive, but not overly challenging. Its good for people who are new to the game and still learning the rules. Hard is better suited for experienced players, and will provide enough challenge to keep the game interesting. Having played this game on and off since the single player update was released, I've won maybe 6 out of 8 games that I've played against the computer on hard mode. So while I'm most likely going to win, there's still that element of danger where if I slack off, the computer will likely pull out a few extra points and steal the victory from under me.
So overall, Blobble is a solid game that's good for people who have a few minutes to burn. My only complaints are that the computer players could use a few tweaks in their decision making, and there's no depth to the game - nothing to achieve from winning. At least, not when you're playing by yourself. But its still a good time waster.