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If you don't have a scroll wheel, then you use the space button instead. Also you can skip levels, you just click on the level you want to play and you can play it.
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For anybody who's wondering what it meant by middle mouse button, it means press down on the scroll wheel, if your scroll wheel doesn't have a click, or you don't have a scroll wheel at all, then I don't know what you can do.
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I agree about being able to skip the levels, don't make them be skippable but this is an amazing game and I hope it wins.