Definitely the second. I sunk so many hours into it on the Wii

I invested multiple hours to complete a pile of the Lego Batman games, and the highest completion percentage achieved was

• Lego Batman: The video game 100.0%

• Lego Batman 2: DC superheroes 74.5%

• Lego Batman 3: Beyond Gotham 100.0%

• Lego DC super villains 54.6%

I had a lot of trouble getting through the second and fourth games.