When comparing Nature's Zombie Apocalypse vs Metal Slug 3, the Slant community recommends Metal Slug 3 for most people. In the question“What are the best local co-op PC games?” Metal Slug 3 is ranked 21st while Nature's Zombie Apocalypse is ranked 88th. The most important reason people chose Metal Slug 3 is:
Metal Slug 3 features 2 player local and online co-op.
Specs
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Pros
Pro Barrel of laughs with a group of friends sat on the couch
Pro Up to 8 player local co-op supported
I don't know who has 8 controllers, but that will surely be crazy.
Pro Kid friendly mode
It has the option to turn off all blood, making it a lot more kid friendly.
Pro Each character has it's own unique move
Each animal has it's own rage move which is pretty awesome
Pro 2 player local and online co-op
Metal Slug 3 features 2 player local and online co-op.
Pro Branching paths
Metal Slug 3 adds a new feature to the franchise with branching paths. This gives more variety to the gameplay and a bit more replay value.
Pro Play in 4:3 or 16:9
Metal Slug 3 lets you pick your aspect ratio. Players can choose from the original 4:3 or a more modern 16:9.
Cons
Con No campaign, just different modes to play
There's no real campaign for the game yet, but it is still in early access, so hopefully something will be added.
Con 16:9 aspect ratio is just stretched
The offered 16:9 aspect ratio is just a stretched version of the 4:3 view.
Con Resolution only as high as 1366x768
There’s no way to play in high definition.
Con Game engine at 30fps
Although 60 frames are rendered per second, the game only updates 30 of them.