Yeroc Sina is a T.O.O.L. planet in Gun Bros. Yeroc is the only planet that features allies, the Babes. This planet and Ceres 2 are the only planets where the enemies have different XP values (for example, the Gillie, appearing on Wave 5, gives 2 XP per kill while Cerberus Prime's Robocrab gives 5 XP). There are not as many machine enemies on this planet as on the others, this is probably because it is a forest.
Recruits are on their way back from war in the forests of Yeroc. Protect them until the mother ship can pull them off planet!
The Babes are in trouble! Defend the area as babes make their way back to you! Save them!
Yeroc Sina is an earth-like planet that apparently has forests and oceans. Yeroc has a warm, tropical climate, as the map features many tropical plants and palm trees. There is a beach on the far left side of the map. The map consists of different islands separated by various canals and connected to each other via wooden bridges. There are also a few buildings located on the map. There are explosive barrels located around the map, they can be used to blow up enemies.