Disney Infinity: Marvel Super Heroes Access
: A separate piece featuring a Spider-Man symbol being consumed by the Venom symbiote. It allows you to play through the Manhattan-based Spider-Man storyline.
The "good piece" you're referring to is likely the piece . This translucent blue sculpt of Avengers Tower is the core component that unlocks the primary story campaign in Disney Infinity: Marvel Super Heroes (2.0 Edition) . Essential Marvel Play Sets Disney Infinity: Marvel Super Heroes
“All the Avengers Figures (including Hulk, which will be released later than the game itself) and a special collector display for the complete team... I need this.” Reddit · r/Disney_Infinity · 11 years ago : A separate piece featuring a Spider-Man symbol