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Toxic Refinery and Nuclear Plant will both be available to play in all their low-res glory, with everything in the environment - walls, objects and so on - looking exactly as they did over two decades ago, while the enemies you fight are ripped from last year's game.The classic maps are played in the same way as the full game, with either a pair of Move controllers or a standard DualShock. Free movement is also an option, so it plays like a standard first-person shooter rather than teleporting from one position to the next.The maps are unlocked by playing through the main campaign, although it's currently unclear if they're accessed in the same way as 2016's console version.