Chikyuu Boueigun 2 Portable is an Action, Adventure, Shooting, Open-world, and Single-player video game offered by Sandlot. The game is also known as the Earth Defense Force 2 and serves as the third main entry in the series of Earth Defense Force. The player assumes the role of a soldier of the EDF with a task fighting against giant insects and robots.

While exploring the world, the player can view the environment using a third-person perspective. The player can control the character in two soldier modes, such as foot soldier in which the player utilizes conventional weapons like snippers, rifles, rocket launchers, and the other is jetpack-equipped soldier mode that allows the player to use energy-based weapons.

The game offers 300 different weapons, but the player can control only two arms in the playfield. More guns will unlock as the player grabs all the collectibles dropped by enemies. The hoverbike, helicopter, and tank are also available for the player in some missions to follow the enemies in different directions.

This game come up with more than 70 missions in seven different locations. There are five difficulty modes the game introduced, and all the tasks completed by killing enemies present on the playfield. The player can recover his health by collecting all the medical kits and armor chips granted by killed enemies. There is also an impossible mode in the game that unlocks when the player receives all the medals.

Earth Defense Force 2 has significant features, such as Different Vehicles, Two Soldier Modes, More Than 70 Missions, 7 Environment, 300 Weapons, Five Difficulty Modes, Third-person Perspective, and Impossible Mode.