
Other Worlds  How old are you in Martian years? 

Sudoku slam  Online sudoku puzzle generator/solver 

3n+1  A simple but unsolved mathematical problem 

How fast  How fast are you travelling right now? 

Primes  Like 2048, but make the biggest prime number you can 

Falling time  3D time, constantly falling. 

Paperclips  Build your own paperclip empire 

Dice Simulator  Seconds of fun. Roll 6 ones? 1 in 47,000 chance 

CurrentMillis  How many milliseconds is it since the start of 1970? 

Covid Calculator  Interactive epidemic explainer 

Robot Jobs  Will robots take your job? 

Gridwatch  The UK's National Grid Status 

Mousepoint  A clickless mouse game 

Desmos Art  Drawing with equations. Check out "Paris street" 

What did Bowie do?  What did David Bowie achieve when he was your age? 

Octamatics  The power of eight 

xmas clock  Is it Christmas yet? 

Sleep Calculator  If I go to sleep now, when should I wa... ZZzzzzz 

Wealth inequality  Scale graphics of wealth inequality in the USA 

List of numbers  A list of numbers (incomplete) 

Chaos Equations  Mathematical fireworks 

2048 cubed  2048 in a 3D cube! Arrow keys, F, and V to slide. Spin the cube with the mouse. 

Circular  How well can you draw a circle? 

primes  Ten thousand prime numbers 

Spend  Spend Bill Gates' money 

Nonogram frvr  Nonogram puzzles. Gorgeous! 

US Debt Clock  Some frighteningly large amounts of money. 

Paper  Keep folding the paper 

Kamogo Lottery  How long will it take to win? 

Combination lock  Addictive "Crack the code" math game  progressive and multiplayer modes. 

Your birthdate in Pi  Find your birth date in Pi 

Boogie maths  Maths explained through the medium of dance 

One million giraffes  His friend Jørgen... 

Adding machine  Binary adding machine powered by marbles 

McDonalds every second  What McDonalds sells every second 

Binary comes to life  011010011 

2048  Remember this? Use the arrow keys to combine blocks, try to reach 2048 

Accomplished  Things people have achieved at your age 

Progress  Visualizing cycles 

Secret Santa  How to do Secret Santa properly 

Mandelbrot Set  Mandelbrot  an exploration in pure mathematics 
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