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A few minutes a day, sharper every week.
Congak (mental arithmetic), a daily quiz, and 21 games for memory, logic and focus. Free, in your browser, in English or Bahasa Malaysia.
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Congak
Mental arithmetic against the clock, five levels deep. Nine questions on a weekday, fifteen at the weekend.
Daily Quiz
One question a day, fifteen seconds, and a streak worth protecting.
Games
21 games for logic, memory, words and reflexes — Sudoku, Minesweeper, Wordle and more.
Tools
CGPA, SST and income tax, unit conversion, exact ages, random picks and team splits.
Blog
How these skills actually work — congak methods, digit span, why sudoku isn't really maths.
21
Games
6
Tools
50
Quiz topics
2
Languages
Latest from the blog
All articles →24 October 2026
Just Over a Marathon in Five and a Half Years: The Maths of Perseverance’s Mars Record
NASA’s Perseverance rover has now driven farther than any vehicle on another world: 45.22 kilometres. That is just over one marathon in five and a half years. Here’s the congak behind the record, from metres per day to why it passed the old mark only 31 metres into its record-setting drive.
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20 October 2026
ECRL Opens 12 December: The Fare Maths From Gombak to Kota Bharu
The East Coast Rail Link starts passenger services on 12 December, with 30% off economy tickets for the first month. Here's the congak: the average speed, what a ticket costs per kilometre, what a family of four pays, and why a 50% discount and a 30% discount would never add up to 80%.
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16 October 2026
The 801st Unit: Why One Extra kWh Can Add RM39 to Your Electricity Bill
Until 31 December, homes using 800 kWh or less a month pay no fuel surcharge on their electricity bill. But once you cross the line, the surcharge applies to every unit, so the 801st kWh brings almost RM39 with it. Here's the congak, and what changes when the line moves back to 600 kWh in January.
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Why a few minutes beats an hour
Everything here is built around short, daily practice rather than long sessions, because that is what the evidence supports. Material spread across many brief sittings is retained far better than the same material crammed into one — an effect so well established it has its own name, the spacing effect.
So the Daily Quiz asks one question, not twenty. The Congak challenge runs about two minutes on a school night and around five at the weekend. A game of Sudoku takes as long as a queue at the mamak. None of it is designed to fill an evening, and none of it punishes you for missing a day beyond breaking a streak.
What's actually here
The 21 games split roughly into logic (Sudoku, Minesweeper), memory (Number Memory, Simon Says, Memory Match), words (Wordle, Hangman, Anagram, Word Search), arithmetic (Number Pop, Whack-a-Mole) and attention (Reaction Time, Color Match). Four of them — Tic-Tac-Toe, Connect Four, Checkers and Dots & Boxes — can be played against another person on the same phone.
Alongside them sit 6 everyday tools that have nothing to do with play: a GPA and CGPA calculator on the 4.00 scale Malaysian universities use, an SST and income tax calculator at Malaysian rates, unit conversion, exact ages, a random picker and a team splitter. Several exist because a teacher needed them.
The mental arithmetic is congak — the rapid oral practice taught in Malaysian primary schools — rather than a generic maths drill, and the whole site runs in English and Bahasa Malaysia one tap apart. If you grew up switching between the two, nothing here asks you to pick.
Free, and no account needed
Every game, tool and quiz is free. There is no paid tier, nothing to install, and no in-game purchases. You can play the whole site without registering — an account only saves your streaks and scores to the server, so they survive a cleared cache and follow you from your phone to a laptop.
The site is funded by advertising, which is why ads appear at the foot of some pages. There is no chat and no way for one player to contact another, which matters given how many of the people here are children.
Pick anything above and start — or read more about who built this and why on our About page.