FULL BRAIN
FULL BRAIN is a free mental math quiz game: pick the right answer to each arithmetic problem before the timer runs out. It runs in your browser with no download, on PC and mobile.
A problem appears on the chalkboard and four answer cards below it. Tap the right one before the timer bar empties. A wrong answer or a timeout costs a heart and lights the correct card green. Every correct answer in a row fills the ⚡ gauge, and when all five segments are full you enter FULL POWER: five questions at triple points. Faster answers and longer streaks score more.
The 60 stages come in twelve blocks: addition, subtraction, mixed add and subtract, times tables, division, all four operations, fill in the blank, three-number problems where multiplication comes first, big numbers, true or false, everything mixed, and the final block. Numbers grow and the timer shrinks as you go. Beat stage 60 for the BRAIN KING ending and unlock the endless ∞ mode on the title screen.
The teacher points at each new problem, cheers when you are right and looks sorry when you are wrong. Each stage awards up to three stars for hearts left, and progress is saved in your browser so you can continue later. Use the 1 to 4 keys or click on PC, and tap the cards on a phone.
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- Type
- Quiz game · Brain training · Arithmetic
- Built in
- 1 day
- Tech
- HTML5 Canvas · Web Audio
- Players
- 1
- Status
- Finished · 60 stages and an ending · endless mode · saves progress
- Released
- 2026-09-21
- Last updated
- 2026-09-21
Good for — anyone who wants to sharpen mental math, players looking for a short brain game, and anyone brushing up on times tables and arithmetic for fun.
Frequently asked questions
Do I need to install FULL BRAIN?
No. Open the link and it starts in your browser. There is nothing to download and no sign-up.
Is FULL BRAIN free?
Yes, it is completely free. You can play to the end without paying.
How do I play this math quiz game?
A problem appears and four answer cards are shown below it. Press 1, 2, 3 or 4 or click a card on PC, and for true or false questions you can also press O or X. On a phone, tap the card.
Does it work on phones?
Yes. It works on phones held upright and on PC.
Is it hard?
Stage 1 is single-digit addition with 8.5 seconds per question, so the first stages are easy even without knowing the rules. Numbers grow and time shrinks as you go, and the final stages give three-number problems and big divisions in 3 to 6 seconds.
What is FULL POWER?
Answer five questions in a row correctly and the ⚡ gauge fills up. For the next five questions you score triple points and the problems get a little harder. One wrong answer empties the gauge.
How many stages are there?
60 stages in twelve kinds, from addition to three-number problems and true or false. Beat stage 60 for the BRAIN KING ending and the endless mode.
Is my progress saved?
It is saved in your browser. Open it again on the same device and browser to pick up where you left off. Nothing is sent to a server.
