ezpz - Okay, I am as confused as you, what do you even mean?! For each viewpoint on what do I think you want to know, here is an answer.
(1 - How do I run JS scripts using built-in Algodoo?!) thing is, you cant.
(2 - How do I run JS scripts using website Algodoo?!) inspect element duh
(3 - How do I run JS from my computer in Algodoo?!) you can only execute thyme using the run command in Algodoo, but still pertty useful.
(4 - How do I run JS scripts for fun?!) No way you can do that in Algodoo, even if you tried. Probably try some site such as repl website for programming languages and coding.
I guess The more luck you have, the more you can pass. Just hold right, you have unlimited attempts on each stage!!! If you die, you just respawn to the closest checkpoint, not to the start...