Ah, makes sense. I had one sitting still in the spot where I needed to be in order to jump to the next platform. Loved the game though.
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Oh I see what the problem was, yeah, I guess that's an issue! I hand-picked initial conditions for some of them (e.g. the screen where I show that two pendula with the exact same IC will behave exactly the same), but for most of them I went with random starting angles, so just sitting vertically is also a possibility, haha!