Gamers' Temple writes:
"A good part of this review will be familiar to those of you experienced with the first Skylanders game because, frankly, there's not much that's different in the game series' second iteration. Once again the game's core features are the Skylanders action figures and the Portal of Power that brings them to life in the game. If you already have a Portal of Power from the first game it will continue to work with Skylanders Giants, although the new Portal of Power uses a USB cable for power rather than batteries so depending on how quickly you eat through batteries it may pay for you in the long run to "upgrade" to a new Portal. As for your original Skylanders figures, they are also compatible with Skylanders Giants, and will retain their experience, gold, upgrades, and hats when used in Giants. The converse is not true, though, as the new series of figures will not work in the original game, and any hats your original Skylanders pick up in Giants will not be available when they return to the original game. However, any of your figures from the original game that reached the level cap will be able to start earning experience again in Giants, as the original level cap of ten has been raised to fifteen."