First two items are slurpees and shotguns.
At the moment they're gathered by matching 4 and 5, respectively.
Slurpees can be used on brains occupied by zombies and cause a brainfreeze that prevent the zombie from advancing for 3 turns.
Shotguns are equipped by scientists and fire automatically when the zombies advance from the second slot to the first. (Shotguns can be equipped while those spaces are occupied and will fire immediately, taking out up to two zombies in the first two slots)
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