SPOILERS:
the professor in the lab in the south isle connected by bridge to the sea city of Glitzfoam will show you 4-tile images that match locations in the world. hidden booster packs await...once you build your deck, go to the city of roads in the upper middle of the world map and go to the lower right tower to face the ultimate challenge,.,,..
another ending: find all the sparkly things and follow the cryptic instructions in the mountain in the island