Unlock Cardboard Characters & Streets Level:
Beat the game on easy to unlock Cardboard Characters & Streets Level in arcade mode.
Unlock Rotating heads:
Get Silver on the Pane in the Neck challenge.
Unlock Hector Babasco and Lean Molly:
Get Gold on Adios Amigos.
Unlock Sewer Zombie:
Get Gold on Behead the Dead.
Unlock feeder zombie:
Complete Day of the damned with a silver/gold in challenges.
(supplied by: Darktan)
Unlock funny hats:
Get a silver or gold medal on the following levels to unlock slilly hats.
| Level: | Hat: |
| 2280 Escape from Neotokyo | Big Ears |
| 1853 Silent But Deadly | Viking |
| 2019 Trouble At The Docks | Pirate |
Unlock story mode characters:
Complete the level on medium difficulty to unlock the bonus character.
| Level: | Character: |
| Return to Planet X | Ozor Mox |
| Wild West | The Colonel |
| NeoTokyo | Sadako |
| Aztec Ruins | Stone Golem |
| Atom Smasher | Khallos |
| Space Station | Reaper Splitter |
| Siberia | Hybrid Mutant |
| Chicago | Big Tony |
| Notre Dame | Jacque de la Morte |
| Robot Factory | Machinist |
Arcade rewards:
On arcade when you get gold in beginner series you get:
Adios amigo:
Hector babasco and lean molly
Casualty:
Dr peabody, Crypt zombie
Top shot:
Hanger level, Sgt shock, Elimination mode
Chasity chased:
Regeneration mode
Shrinking from the cold:
Private sand, Sgt slate, Shrink mode
Scrap metal:
Scrapyard, Chassis bot
Night shift:
Sentry bot, Leech mode
Spoils of war:
Meezer mox, Theif mode
Demolition derby:
Male trooper, Female trooper, Robot factory, Vampire mode
Monkey immolation:
Crispin, Flame tag
Disco inferno:
Louie big nose, Lt wild
Burns department:
Undead priest, Nightclub, Virus mode
Club soda:
Slick tommy, Jimmy needles
Station stand:
Lt shade, Zone mode
Men in grey:
Accountant, Lawer, Assualt mode
(supplied by: Darktan)
Mini games:
Siberia, Anaconda cart:
When you reach the other side of the dam, and enter the building, there are two guards, next to the patrolling guard on one of the shelfs, there is the anaconda cart, on the bottom. NOTE: Found on easy,normal & hard. Press triangle when temperal uplink is equippted.
Neotokyo:
You must play normal/hard for this one. At the place you can get a machine gun there are 2 doors to open one with mahcine gun and one with this minigame
Robot factory. Retro racer cart:
This is found in the big room with the last energy node, (the room with all the sentry bots). Down the ramps on the other side, underneath the one on the right is the cart. NOTE: This is only found on hard and on hard ALONE! (1 player).
(supplied by: Darktan)
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Source: 
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