The best of scribblenauts comes together in the Scribblenauts Mega Pack! Combining two classic games with all new objects, characters and levels to explore. Use the power of imagination to solve exciting puzzles in seamless free-roaming levels. With Scribblenauts Unlimited and Scribblenauts Unmasked: A DC Comics Adventure combined, the fun is limitless!

Scribblenauts Unmasked: A DC Comics Adventure

• Explore new levels with over 200 brand new DC characters and costumes! 
• Use the hero creator to create your own DC super hero or DC super-villain.
• Interact with thousands of DC characters, objects and locations.

Scribblenauts Unlimited

• Explore a free-roaming world powered by your imagination. 
• Interact with 20,000 objects along with a friend - watch them come to life!
• Solve hundreds of puzzles with any object you can think of - or create your own in the object editor.

Source: Official Site