dtgreene: It's a platformer released for the Game Boy Color. I consider this game interesting for 2 reasons:
1. You can't die. Getting hit might get you knocked back, might turn you into a ball of yarn, might set you aflame, or all sorts of other things that could happen.
2. Sometimes, it is necesary to get hit to continue. For instance, there are blocks that can only be broken if you roll into them while a ball of yarn.
Not to mention the blocks that can only be broken if you're on fire after you've run around a bit and stopped running, or if you throw an enemy at it, or stomp on it, or get a power up garlic, or get more powerful overalls, or hit a random lever from the bottom with your head, or light some torches by setting yourself on fire and run into them, or roll into it as a giant snowball that you become after having snow fall onto you and you go onto a slope.
Sometimes, the only thing you can do about a block is get a treasure in another level that will make it go away and then come back later to get what was on the other side.
Sorry, reminding me about the yarn blocks made me remember all the other ones.