This is an expansion and requires the base game to play: yes

Smash Up: Big in Japan brings the most kawaii base-bashing you've seen to Smash Up, with four factions born from Japanese pop culture: anime fighting girls, cute collectible critters that are totally not Pokémon, colorful fighters that are in no way Power Rangers, and Godzilla.

NOTE: The box says that there are 4 dividers and 4 Titan cards in the expansion. However, something truly MAGICAL happened at the factory! Like a group of smaller robots forming into a larger one, the Titan cards became the divider cards! So you aren't missing anything. Quit emailing us.

- AEG Customer Service