It's spritesheet animation – a lot of image swapping, via javascript, when you click on a hotspot. It's a technique that has been around for a while. Their usage of the technique is very polished, but it comes at the expense of pretty large spritesheets.
It's spritesheet animation – a lot of image swapping, via javascript, when you click on a hotspot. It's a technique that has been around for a while. Their usage of the technique is very polished, but it comes at the expense of pretty large spritesheets.
Here's a basic tutorial on the concept: http://gamedevelopment.tutsplus.com/tutorials/an-introduction-to-spritesheet-animation--gamedev-13099