The Doomsday: Last Survivors crossover with Metal Slug 3, features a brand new hero, and a ton of themed rewards and events. The event, known as ‘Puzzle Event’, sees you draw puzzle pieces gacha-style, and use them to try and complete a jigsaw to earn rewards. Aside from the brand new hero, you can also earn new vehicle, squad skin, armament set, shelter skin, and many more. It’s Metal Slug 3 cosmetics heaven. Additionally, ‘Metal Trial,’ challenges you to complete stages using preset heroes with unique strengths.