Attack of the Radioactive Thing — Infinite Warfare Zombies Easter Egg Guide

Grab the removable switch handle from the zombie hand jutting out of the sand on the Beach, right by the OSA wall-buy. Carry it uphill to the Power Station near the drive-in, interact with the empty power box inside and throw the completed switch. Power is global — this one switch lights the whole map.

Four interactions, in order:

• Spell Book — with power on, open the now-unlocked safe in the Ice Cream Parlour back office and take the book.
• Empty vial — give the book to Elvira on the TV Studio set and let her line finish; she hands the team an empty vial (tracked on the scoreboard).
• Fill it — take the Meat Cleaver from behind the Beachside Market counter (by Deadeye Dewdrops) and kill roughly 20 zombies with it (co-op shares the count); watch the vial icon, not a memorised tally.
• Return & escort — give Elvira the full vial, wait out her dialogue, then stand at the closed projector portal just outside the TV Studio and keep her walking route clear until she activates it.

Step through for about 30 seconds of Pack-a-Punch. The portal then moves for the rest of the match: after ~45 seconds it reappears either behind the Ice Cream Parlour or in the centre of the RV Park, marked by a lightning storm overhead — it never returns to the TV Studio.

If Elvira won't open it, re-check the vial is full, let any dialogue end, and stand right on the closed portal with her path clear.

Three tools gate most of what follows — collect them while Elvira's vial fills:

• Crowbar — inside the Motel maintenance room near Bombstoppers; it opens the mirrors, the safe desk, the gauges and many ingredient containers.
• Cleaver — behind the Market counter (it also fills Elvira's vial and drops the radioactive-soldier leg).
• Freezer Trap — take the freezer part from the boxes on the left side of the Gas Station and install it on the wall inside the Market freezer; it is required for the torso.

Also build the Seismic Wave Generator now (see the side quest below) — it raises the buried arm and is a required boss-phase tool.

The reconstruction needs six body parts (the three mirrors come next). Each has a fixed method:

• Head — press the projector-room wall button; the exit drops you into a locked RV for about six seconds — take the head from the ledge in front of the large window.
• Torso — activate the repaired Market Freezer Trap with the Crowbar and, during or just after the freeze, melee the hanging pig immediately right of the torso, then take the exposed torso.
• Left arm — in the firepit right of the Volk wall-buy in the RV Park.
• Right arm — back at the Beach hand that held the power handle: set the Seismic Wave Generator near the buried arm (not on top), let the slams raise it fully, then interact.
• Left leg — from round 5, kill a Radioactive Soldier zombie with the Cleaver; the first qualifying Cleaver kill is the guaranteed drop (search the ground if it seems not to drop).
• Right leg — on the Snack Shack-to-TV-Studio path, look in the last tree on the left by the TV perimeter fence and cook a Frag or Cluster Grenade at the hanging leg; pick it up when it falls.

Use standard Frags or Clusters on the leg — C4 and Bio-Spikes often miss the branch. Every part shows on the scoreboard, so check there if a prompt is missing.

Three reflective pieces feed the reconstruction laser:

• Elvira's mirror — after you return the full vial and Elvira eventually despawns, take the mirror on the TV Studio couch (only when the prompt says she is not there).
• Bathroom shard — Crowbar the intact mirror in the RV Park bathroom; a shard falls into the sink — take it from the basin.
• Car side mirror — on Main Street, Crowbar the right-side mirror off the white car that still has its roof and grab it from the ground.

Carry all nine items to Spawn: the six body parts on the upright examination bed right of the tunnel exit; the bathroom shard on the pill-bottle table left of the body; Elvira's mirror on the crates right of the zombie spawn; the car mirror on the large crate across from Up 'N Atoms.

Order doesn't matter, but the laser stage isn't reliable until all nine placements are visibly done — verify on the scoreboard.

Take the punch card from the desk in the Ice Cream Parlour back office and insert it into the small number machine just right of the car-mirror crate in Spawn. Then read the code off the five film reels in the TV Studio: four sit on the shelf by the map-colour console and one lies on the floor — read them left to right, treating the floor reel as position three. The digits are a random permutation of 3, 4, 5, 6 and 8 (no repeats). Each reel is a film whose title maps to a fixed digit — Mayday = 3, Awakening = 4, Point of Contact = 5, Nightfall = 6, Exodus = 8 — so if a reel is hard to read, its title tells you the number, and a code that isn't a clean permutation of 3/4/5/6/8 means you misread one.

• Forward code — at the machine, ten lights show digits 0-9; interact as the light for each required digit is lit. Three misses (or taking a hit) eject you, but the accepted prefix is kept — reconnect and continue.
• Fire the laser — interact again; the beam bounces between the mirrors and rebuilds the body. Keep the area clear until the animation finishes.
• Reverse code — use the machine once more and enter the same five digits in exact reverse, then interact again. The rebuilt zombie turns into a key — collect it from the bed.

Carry the key to the closed Gas Station garage on Main Street and open it to reach the chemistry table and the nuke.

Note this pair as FILM FORWARD and FILM REVERSE — it is a different code family from the safe / belly code and must never be confused with it.

Two builds inside the opened garage. The Chemical Station takes three parts:

• Tube — on the couch in the Market back room.
• Gauge — on the picnic table nearest Mule Munchies in the RV Park.
• Screen — on a picnic table down the slope from the RV Park to the Beach.

The nuke takes three more:

• Road part — under the front of the red car on the road between the Motel and TV Studio.
• Stream part — at the end of the stream below the wooden bridge, under the large concrete Beach bridge.
• Fence part — on the right-side fence behind a gate approaching the TV Studio from the Snack Shack.

Assemble the three station parts on the empty garage table and install the three nuke parts into the nuke.

Older notes call the red-car part a spot 'under the red cat' — it is the red car between the Motel and TV Studio.

With the Crowbar, go to the Market back office with the safe and desk. Go prone on the desk's left side and read the four hidden numbers — write all four down. Then set each on one of the four pressure gauges, striking the rotating needle with the Crowbar as it reaches a chosen number:

• Gas Station — rear wall of the building.
• Snack Shack — right side of the building.
• Power Station — rear of the power-switch building.
• Motel — inside the maintenance room.

Any desk number can go on any gauge, but all four values must be represented; a second Crowbar hit resets a wrongly-stopped gauge. When all four are correct, return to the safe and take the paper — its number sequence is your SAFE / BELLY code, used at the very end.

Copy the code to a note outside the game immediately — during the final belly sequence the scoreboard view is obstructed and can't be trusted.

This decides which colour filter shows the correct chemical numbers, so do it before reading any diamond board.

• M — in the Motel office, on the wall immediately right of the window. Record it exactly.
• True O — four O candidates exist: the Gas Station front door, the Market back room above the couch, the underside of the concrete Beach bridge, and the locked-RV refrigerator (view through the front window by jumping, or during a projector-button RV visit). At the TV Studio console, cycle Red / Green / Blue and inspect all four each time: the false ones flip to 'O is not equal to' in one of the colours — the true O is the single candidate that stays 'O equals' the same number in all three.

Multiply M × O, then read the television beside Elvira: it lists numeric ranges tied to Red, Green and Blue. The band your product falls into is your chemistry colour for the whole game — set the map to it on the console and leave it there.

Some guides mislabel the Motel value as 'N' — it is the Motel wall value (M) multiplied by the surviving O. Keep the M×O product separate from every reaction code; it only picks the colour.

From about round 10, ordinary zombies drop a battery. Carry it to either repairable radio — the Power Station radio by the porta-potty or the Motel office radio on the couch — install it and interact repeatedly. One radio is Dr. Bright's chemistry exposition; the other evaluates the five possible anti-Crog compounds. Listen for the one named the 'perfect solution' to the mutated-crab problem and record only that one:

• 3,4-di-nitroxy-methyl-propane
• 1,3,5 tera-nitro-phenol
• Octa-hydro-2,5-nitro-3,4,7-para-zokine
• 3-methyl-2,4-di-nitrobenzene
• 2,4-propane-3,5-tetra-nitrite

Ignore every rejection — a chemical called a 'rather crude solution' is still a no. If all lines have played, end the round to rewind the tape. Community spellings vary (tera/tetra, para-zokine/-zocine); the spoken line is authoritative, and the ingredient chain is unaffected by spelling. Some launch guides list only four compounds — the fifth (2,4-propane-3,5-tetra-nitrite) is real.

Each ingredient has a fire diamond on one of six boards — Spawn (tent hallway by the lab), TV Studio (wall right of Bang Bangs), RV Park (beside an RV near Mule Munchies), Beach (near the water below the RV-to-Beach path), the garage (in or beside the nuke area) and the Power Station route (dirt path behind the Market). Read them in your chosen colour and use only the TOP (red) and LEFT (blue) number of each — ignore right and bottom.

Reaction code = (sum of every placed item's TOP + LEFT) − O. For example, with O = 8 and three items whose diamonds read 4+7, 2+4 and 2+3, you enter 4 + 7 + 2 + 4 + 2 + 3 − 8 = 14. Your target is a chain of two to four sub-reactions: place each reaction's ingredients on the floor squares by the tubes, enter its code on the keypad and hit the reaction button, then collect the produced intermediate from the garage's right side before the next row. Crucially, when an intermediate is used in a later reaction, read that intermediate's own diamond values — not the values of the ingredients that made it.

The five recipes are fixed — only the numbers and which target you're given change. Craft your target's chain top to bottom, collecting each intermediate from the garage's right side before the next row:

• 3,4-di-nitroxy-methyl-propane: Vodka + Pennies → Acetaldehyde · Racing Fuel + Quarters → Formaldehyde · Acetaldehyde + Formaldehyde + Detergent → Aldehyde Sludge · Aldehyde Sludge + Nail Polish Remover → the compound.
• 1,3,5 tera-nitro-phenol: Motor Oil + Wheel Cleaner + Insect Repellent → Phenol · Phenol + Drain Opener → Phenolsulfonic Acid · Phenolsulfonic Acid + Detergent → the compound.
• Octa-hydro-2,5-nitro-3,4,7-para-zokine: Racing Fuel + Quarters → Formaldehyde · Formaldehyde + Glass Cleaner → Hexamine · Hexamine + Vinegar + Plant Food + Detergent → the compound.
• 3-methyl-2,4-di-nitrobenzene: Paint + Detergent + Drain Opener → Methylbenzene · Methylbenzene + Baking Soda + Vinegar + Detergent → Dinitro · Dinitro + Racing Fuel → the compound.
• 2,4-propane-3,5-tetra-nitrite: Fat + Vodka → Glycerol · Detergent + Drain Opener + Ice → Mixed Acid · Glycerol + Mixed Acid → Nitrated Glycerol Solution · Nitrated Glycerol Solution + Baking Soda → the compound.

Where to find each ingredient: Racing Fuel (in front of the Gas Station) · Motor Oil (garage floor once it opens) · Quarters (Crowbar either Gas Station payphone) · Vodka (Market liquor shelf) · Baking Soda (right of the Market middle shelf) · Detergent (left of the Market left shelf) · Ice (Crowbar the Market ice machine) · Vinegar (Market back-room table) · Glass Cleaner (front of the Market right shelf) · Wheel Cleaner (left of the Market middle shelf) · Fat (Cleaver the top of the leftmost hanging freezer meat) · Pennies (Crowbar the Market register) · Insect Repellent (Spawn hallway right of Up 'N Atoms) · Plant Food (left side of the Snack Shack) · Paint (behind the small shack near Racin' Stripes on the TV-Studio path) · Nail Polish Remover (Motel office desk) · Drain Opener (a toilet in the RV Park bathroom).

Helper for the arithmetic: Chemical Formula Calculator — it sums TOP+LEFT and subtracts O. The M×O colour band is deliberately kept in this walkthrough, not in the tool, because it is a per-match threshold rather than fixed arithmetic. A failed mix does damage and yields no product: re-check the colour, the O subtraction, the ingredient set and whether you used an intermediate's own values.

Take the finished target compound from the garage's right side and interact with the nuke (its three parts already installed). If no prompt appears, the radio target or the final compound is wrong. Once it attaches, every player interacts to charge the nuke, then interacts again to launch the boss sequence.

Fully prepare first — perks (Tuff 'Nuff, Quickies, Bang Bangs), a Pack-a-Punched high-reserve bullet weapon, full ammo and a charged Fate & Fortune hand — and make sure every player has the SAFE / BELLY code written down.

The team teleports to the Beach. Push the nuke cart to the water by standing close to it; each time it stops and restarts, Crog-Zilla launches eggs and fireballs — shoot them out of the air and keep someone in movement range. At the shoreline the cart fires the nuke into its mouth, and the boss adds an antenna laser (a small sidestep) and a lethal ground slam (one or both claws raise first — run a long lateral route until impact).

Grab a death ray pickup — four spots: beside the OSA wall-buy, on the path from the Beach toward the RV Park, on the path uphill toward Main Street, and on top of the concrete bridge. When the chest weak point glows during an attack, hit it with a death ray: the first confirmed hit shows a skull icon and leaves the chest vulnerable, after which more death rays or a Spartan SA3 keep damaging it. Land about three to four chest hits until the glow dies and the boss pauses, then have every living player interact with the cart to start the next phase.

A Max Ammo spawns by the OSA wall-buy when the fight begins and respawns a couple of minutes after each pickup — use it. Stop hitting the chest when the glow disappears, not at a fixed ray count.

Charging the cart coats the front Beach in advancing radiation that forces the team back toward the wall under the bridge; Crog-Zilla fires two egg-and-fireball sets per spit — shoot projectiles, kill adds and never stand in the green zone. When the radiation clears, a laser obstacle course appears between the team and the cart: jump the high beams and slide under the low ones, and every player must reach and interact with the cart before the timer ends.

The team is then pulled inside the belly, where each player gets a cycling-light keypad and must personally enter the SAFE / BELLY code from the Market safe (it works like the Spawn number machine — stop the light on each digit). Each player has three strikes per attempt and three attempts.

A missed laser run or a failed code just repeats a shortened radiation-and-laser cycle — it is recoverable. Use the SAFE / BELLY code here, never the film codes.