iNekojarashi is a simple application intended for cats that allows you to add a moving object to the black screen to catch the cat's attention. The cat will observe the moving object and will try to catch it. Try to cut the cat's nails before making this game play on your computer's screen. The program includes several types of objects to add to the screen, such as a bouncing ball, a snake, black flies, an eel, and a wire, to name but a few.
You can also add more than one object at the same time and customize the movement speed. I recommend to start with the slow or normal speed, and then use the other ones. Try not to get your cat crazy and let them rest after they play for some time. All the objects have a different size and color, but this is not customizable. It would also be great if you could select the background color. Graphics and sounds are very simple, and, sadly, there is no music.
To conclude, if you are looking for a simple application to have fun with your cat, iNekojarashi may be a good choice.