It doesn’t take too long to figure out what you’re supposed to do. Figuring out the mechanics takes a tad bit longer.
http://www.smart-kit.com/games/IO/
I did it in 24 minutes, which I am pretty proud of 
(Until one of you comes along and does it in 2).
It took me 27 minutes. I might have done it a bit more quickly if I had realized to begin with that you have to scroll to see the entire ‘game board’.
14 minutes. Good puzzle!
I did it in 13 - so I’m either smarter or unluckier than you. 
I think this series of puzzles is by the same creator: http://fizzlebot.com/cdt3.php
They are similar to the one in my OP in that you have to figure out what your goal is, and then how to achieve it. I’m having a lot of fun with them, am about 75% of the way through after about 2 hours (somewhat intermittent though).
If anyone tries them, and manages to solve 6, I’d be really grateful to get a clue. Without spoiling, let me just say that I cannot figure out how to get it to work with only 4 nails.
I thought this was going to be about Where At You Did The Egg Put?
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Neither I hope - there was a show with Jessica Jane Clement in it on the TV, and I got a trifle distracted.
Okay - after playing that game for a couple of minutes I would like to say - WTF?
Can’t you live in a world where I’m smarter than you, jjimm? 
It’s actually quite simple. If you don’t want to figure it out yourself, look here.
No.
10 minutes–booyah!
Daniel
The click and drag site has some good puzzles - I’ve completed about a third of them but some of them have left me scratching my head for a variety of reasons (either I have no idea what I’m supposed to do, or I’m sure I do not what to do but the game won’t let me).
Ended up taking we 16 minutes… woulda had it in about 10, but I added wrong, and had to start over. There really ought to be a subtract box.
I’ve managed to complete them all so if you have any questions, feel free to ask.
16 minutes. Not too bad, I kept hitting the wrong arrow and fouling up my plan and having to reset.
11 minutes, was very easy after I figured out what the arrows did.
Hint: If you keep the box above red filled and do red last, you can use the fact that you cna add one to your advantage. I didn’t really have to spam one into the combo boxes that much, but the ability to do so is handy if you need only three or four)
I might do that actually - expect Illuminated email sometime soon.
10 minutes here too. Does it matter what order you do it in? After I figured out what was going on it seemed pretty simple but I half suspect that I was lucky in that there were always plenty of options for formulating the numbers.