The goal of Cat Lab! is to collect the stray mice that has escaped. The mice will be perched on ledges and you'll have to navigate your cat to each ledge to capture the rodents. You control you cat by touch, first by tapping/holding to lift the cat to the starting point and then by tapping the cat to make it jump to the various ledges. Once started, the cat will works its way to the opposite side of the screen without stopping. So you'll need to plan your routes carefully. At some point, you'll get an extra cat to cover all the ledges and find yourself dodging puppy dogs, bats, and even boxes that will tangle you up. If you capture two of the three mice, you'll be able to advance to the next level.