I want to see how many people end up solving this... it's so obscure!!
The idea came from (a) much older level(s) where people kept finding loopholes and I gave up on fixing them. This is a harder version that should be loophole-proof... I hope!
So yeah, the idea is not new, but can you find it here?
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Rest in peace, Kym. I hardly knew ya. Rest in peace, Marinus. A bright star, you were ahead of me on my own tracks of thought. I miss you.