Fun game!

I have a suggestion: the huge numbers are not quite readable. Maybe add the scientific notation as well. Comparing 73,400,000,000,000,000,000,000 with 844,000,000,000,000,000,000,000 is tricky, especially since the numbers are not right aligned.

Adding a 73.4×10^21 vs 844×10^21 would be helpful.

I like the big numbers with lots of zeros: works for kids as well.

IMHO it could lose some of the silly charm with scientific notation.

But having the numbers aligned for easy comparison would be great.

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To OP: I really like this! Will be guessing some with my kids who are around 10 year old. Combined weight less than an elephant.

OP here. Thanks! Will be testing with my 6 year old later. He actually hasn't seen it yet. Yeah, I agree. I wanted something that everyone can read and where the physical size of the number on the screen gives a great idea of the size (in terms of order of magnitude). Alignment is a great idea. I'll have a think about that one.

    4,200,000,000 (4.2 billion)  
        1,000,000 (1 million)
          900,000 (900 thousand)

This kind of formatting would be great - for kids learning about bigger numbers and their names.

Oooo, I like that. That's really clear.

Yeah, I'd find that more readable too. I aimed for something anyone could understand.

Maybe greek prefixes or even spelling out the bigger units? I.e. 9.4 gigagrams or 54 billion kilograms.

Of course you might have the issue of short scale vs. long scale billions but a footnote should solve that.

Yeah. A friend was playing with a group in a room and one of them was trying to read out the questions. Not a problem with 800 gorillas but it is with bigger numbers. Hmm, not sure what to do. The Greek prefixes I find really hard to remember! For simplicity and debugging it was easiest to just slap the numbers up.

Could you just have a simple bar graph that showed their relative sizes? Two numbers with a bunch of zeroes are hard to compare.

That'd be great to see!

Perhaps a toggle?

I don't know if self hosting is an option for you, but recently I deployed Trilium (https://github.com/zadam/trilium) on a personal server.

It's really easy to set up with docker and I'm amazed at the wealth of features.

I use it on desktop and mobile too without issues.

Thanks. I'll have to try that again. When it came out, I had problems installing it.

*Free - just as in "beer".