24
Heads
12 monsters × 2 copies. Match a head, body and legs to complete a monster.
The ridiculous card game of building monsters and surviving toilet emergencies.
What you actually get
A premium box, an instruction booklet, and 120 cards of pure mayhem!
Drag, scroll or swipe →
Welcome to the universe
Mayhem Games
Monster Mayhem is the first. More games, more monsters, more stories — all set in the same wonderfully ridiculous world.
-
Coming Soon
Monster Mayhem Card Game
£18.99
The ridiculous card game of building monsters and surviving toilet emergencies! Welcome to Monster Mayhem — the fast, funny, slightly chaotic card...
Get notified → -
Coming Soon
Candy Chaos Expansion Pack
£12.99
Things just got sweeter… and a whole lot messier. The monsters have broken out of the candy store—and now they’re running wild....
Get notified → -
Coming Soon
The Comic, Issue 1
From £2.99
Where slime flies, chaos rules, and every page is packed with trouble… Welcome to the wildly unpredictable world of Monster Mayhem, where...
Get notified → -
Coming Soon
The Comic, Issue 2
From £2.99
Where slime flies, chaos rules, and every page is packed with trouble… Welcome to the wildly unpredictable world of Monster Mayhem, where...
Get notified →
How it works
1
Draw Cards
Loudest monster roar or youngest player goes first. Each player gets 5 cards to start. Then draw 2 cards each turn. Heads, bodies, legs, wild cards, chaos cards — you never know what you'll get.
2
Build Monsters
Mix and match parts to build complete monsters in front of you. One head, one body, one set of legs — but no mixing across monsters. You can build a maximum of three unfinished monsters at once.
3
Cause Mayhem
Steal, destroy, protect — and survive the legendary Toilet Emergency. First to finish 3 monsters wins, and becomes the envy of every other monster-builder at the table.
What's in the box
120 cards. Twelve monsters' worth of heads, bodies and legs. Wild cards, chaos cards, shields — and the legendary Toilet Emergency.
24
Bodies
Mix-and-match-able only with their own kind. No Pizza-on-Wizard cheating.
24
Legs
Twelve sets in twelve flavours, from Sushi to Sewer.
14
Wild Cards
Stand in for any missing part — but can't start a new monster.
24
Chaos Cards
Steal, destroy, protect, draw 2. Mess with everyone else's plans.
9
Shields
Block one chaos card from your hand. Single use only.
1
Toilet Emergency
The most chaotic card in the game. Unfinished monsters lose everything. Iconic.
1
Instruction Booklet
All the things you need to know to cause chaos.
Lead designer
Designed by Eva, age 7.5
Eva designed Monster Mayhem at the kitchen table while eating snacks. The toilet emergencies were Eva's idea. Actually, everything was.
Lead designer • Mayhem Games
Meet the Monsters
Twelve weird, wonderful, slightly gross-out monsters. Mix and match heads, bodies and legs to build your perfect chaos crew.
Cool Monster
Doesn't try to be cool. Just is. Nothing fazes him — not even a full-on toilet emergency.
Dirty Monster
Loves getting messy and making sure everyone else does too. Clean hands don't win games.
Disco Monster
Never stops dancing. Even during chaos she's already planning her victory groove.
Electric Monster
Pure energy. Fast, shocking, and a little unpredictable — handle with care.
Graffiti Monster
Blink and it's hers. Graffiti Monster moves fast and leaves her mark everywhere.
Laser Monster
Doesn't miss. When he targets something, it's gone before you can blink.
Pizza Monster
Looks generous, plays greedy. Pizza Monster never leaves a slice behind.
Sewer Monster
Thrives where others won't go. The worse it gets, the better he plays.
Trash Monster
From scraps to victory. Trash Monster builds wins out of chaos.
Sushi Monster
Neat, quiet, and perfectly timed. Sushi Monster strikes before you notice.
Smelly Monster
Clears the room fast. Opponents don't stick around long — and neither do their plans.
Wizard Monster
What you see isn't what you get. Wizard Monster always has something up his sleeve.
Questions, mostly from grown-ups
Is it really age 7+?
Yes. The rules are simple enough for confident readers, the games run 15–30 minutes, and the only adult themes are toilet emergencies and gentle chaos.
How many players?
2 to 8. Best with 3–5. Works as a quick filler or a longer family session.
Is it really gross?
Cheeky-gross, not horror-gross. Think slime, sewers, and one unforgettable Toilet Emergency card. Kids laugh. Grown-ups laugh too. Mostly.
Where does it ship?
UK only to start with. Other markets are coming soon — sign up below and we'll tell you the moment we ship to you.
Will there be expansions?
Yes. Slime Lab, Robot Wreck Crew, Haunted House, Candy Chaos and Monster Christmas are on the way — each with new monsters and a comic-book story to match.
Not on sale yet
Be first to know
Monster Mayhem is nearly ready to escape. Drop your email and we'll shout the moment it goes on sale. No spam, just monsters.