Skylanders: Giants builds upon the fundamentals of the first game, which merges a line of physical toy figures with a video game world. The game introduced over 40 new toy figures, some of which are more than twice the size of the original Skylanders cast in both physical and virtual form. The game involves connecting a physical toy to the video game console through a "Portal of Power"; whichever toy is used creates a respective character in the game. Toy figures from the first game are also forward compatible with Giants, although there are also new versions, called "Series 2", which have more powerful attributes than the originals. A new series of figurines called "LightCore" was also introduced, which glow when put on the Portal of Power and have a flash bomb attack in-game.[ The game has a new and improved "Battle Mode" for head-to-head play, featuring more areas and gameplay options as well as offering a new variety of alter ego Skylanders.