Rocketbirds 2: Evolution is set years after the events of its predecessor. The game follows Hardboiled Chicken as he faces off against his arch-nemesis Putzki, who has somehow managed to survive and is now at the center of a bizarre conspiracy involving alien owls and people being turned into food.
The gameplay is similar to the first installment but with an increased focus on combat and reduced puzzle-solving. Players can aim in 360 degrees, jump, run, and shoot simultaneously, thanks to the introduction of dozens of new weapons such as handguns, rifles, flamethrowers, and miniguns. The levels are more open-ended than before, allowing for discovery of secret areas containing hidden weapons and costume items.
A new feature in Rocketbirds 2: Evolution is the Rescue Mode, a four-player online/offline co-op mode where players control the budgie commandos from the previous game. Their objective is to rescue other commandos across randomly generated themed levels. Players can upgrade their characters by collecting costumes and purchasing weapons from shops.
Rocketbirds 2: Evolution also includes stereoscopic 3D, enhanced voices in both English and Japanese, improved graphics and visual effects, and a new soundtrack by New World Revolution.