How do I get a floor "Solid" and "Jumpthru" at the same time, by without another sprite to bounce him in, a platform game?
Please also create a official forum in Spanish in this website.
I don't really understand the last part of your question. Can you rephrase it?
Maybe write in it in Spanish too, so a Spanish speaking member can try to answer your question.
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Any floor that the player will jump through should only have a "jumpthru" and NOT a solid behavior on it.