Not all figures are compatible with all versions of Skylander games. If the game is older (like Giants) and the figure does not contain the data it needs to to play in the older version, it either will not function at all or it will show up as a lesser version of the character.
So if the package says it does not work with Giants or Spiro's Adventure than it was made for some other version of the Skylanders games and should be used there instead.
For example there are several versions of Trigger Happy released; the Spring 2014 Trigger Happy S3 in particular requires the Portal of Power to be used in-game. This did not exist when Giants was released.
no because the giants can only be used on skylanders giants
Yes you can use all your figurs from Spyro's Adventure. You can even level up your character from 10 to 15 in the Giants game.
No Unfortunately not. The only figure from the Giants game that work in Spyro's Adventure are the series 2 figures. Series 2 figures are characters that were in the Spyro's adventure game, but then reposed for the Giants game. If you are in any doubt, check the side of the packaging and there is a little picture with a cross/tick showing whether the figure will work in Giants or Spyro's Adventure.
no, you cannot use skylanders from skylanders sypro's adventure
there is skylander giants coming
yes...
Yes, the Spyro's Adventure Portal will work on Giants. So you can buy the Portal Owners Pack.
Giants is the second game of Skylanders. Your current Skylanders can still work for Giants. There will be bigger figure and characters you can buy and new story.
Skylanders Giants is a different video game to Spyro's Adventure, however you can use your original Portal of power in the new game. Also, all Skylanders characters from the original game will work in the new Giants game. However, the totally new characters in the Giants game including all the actual Giants and LightCore figures will not play in the old game. Only those reposed series 2 figures produced for the Giants game, but we're also in the Spyro's Adventure game, will play in the original game. Check the packaging on the side of the new Giants figures and there is a diagram tha shows which games the figure will play in.
Your Portal from Spyro's Adventure will work with the Giants game. That is why Activision designed the Portal Owner's Pack. This contains the Giants video game, and an actual Giant Tree Rex. If you already own a portal you do not need the Starter pack for Giants.
There is a sequel to Skylanders Spyro's adventure called Skylanders Giants which is kind of the same just with giant figures. It is coming out in Fall 2012.
Toy's For Bob, an Activision company makes Skylanders Giants and Skylanders: Spyro's Adventure