Q.E.D.

Q.E.D.

Atelier Rayfish · Board game · 2026
3–6 15–30 min
rating Ludopedia
rating BGG
Buy
rating Ludopedia
rating BGG
Our Verdict

Want a fast-paced card game that tests your math skills and agility? Q.E.D. is the perfect pick for those who enjoy numerical challenges with a dash of chaos!

Highlights
  • Fun and fast math
  • Clever tactical decisions
  • Interactive and surprising
  • Great for lively groups
Keep in mind
  • Can get chaotic
  • Requires quick thinking
  • Luck of the draw
HIGHLY RECOMMENDED
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About the game
Get ready for mathematical madness with Q.E.D. (Quod Erat Demonstrandum)! This fast-paced card game is pure adrenaline for number lovers who aren't afraid to prove an equation before anyone else. Each round, a target number appears, and the mission is clear: use your number and operator cards to build the perfect equation that hits the mark. It's a blend of arithmetic reasoning, sharp timing, and tactical decisions that rewards those who think fast and keep an eye on opponents' plays. On your turn, you draw a card and try to complete the equation. If you can't, you must discard a card – which, by the way, could be another player's salvation! And if things get tight, there's the 'Mathjack' move to snatch discarded cards and build a three-card equation, or an instant 'Q.E.D.' if a new card completes your equation. Special cards and scoring bonuses add an extra layer of strategy. You can play it as a single-round challenge or accumulate points in longer matches. In the full game, you earn points for won equations, successful Mathjacks, and bonus combinations, while rivals lose points. The game ends when someone zeros out their score tokens, and whoever has the most points at the end wins. It's guaranteed fun for those who enjoy quick challenges and a bit of strategic chaos!
BEST PLAYER COUNT
3 OK
4 OK
5 OK
6 OK
WHERE TO BUY
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Game details

Families

Admin: Upcoming Releases
Publisher Atelier Rayfish
Frequently Asked Questions
What is the main objective of Q.E.D.?
The goal is to be the first to prove a mathematical equation that matches the round's target number, using the cards in your hand.
How many players can participate?
The game is for 3 to 6 players, making it great for groups.
Is the game difficult to learn?
The basic rules are simple, focusing on building equations, but the interrupt and multi-use card mechanics add a tactical layer that might take a few games to master.
What is the average playtime?
Games are quite fast, usually between 15 to 30 minutes, depending on the number of players and how quickly they solve the equations.
Is the game more about luck or strategy?
It's a mix! Luck in drawing cards is a factor, but strategy in hand management, discard decisions, and using interrupts is crucial for winning.
Is it a good game for people who don't like math much?
It uses basic math (addition, subtraction, etc.), but the focus is more on problem-solving and speed. If numbers don't scare you and you enjoy a challenge, you might like it!
Are there different game modes?
Yes, you can play a single round as a quick challenge or accumulate points over multiple rounds for a more complete experience.