I can probably help you, but I would need to see your code first to check what you did wrong. I'm going to assume you made it so his speed gets set to 0 each time he comes in contact with a solid object? There's an easier (and actually effective) way to set up collision checks for solid objects, but like I said I need to see what you have right now so I can tell you what you did wrong and what you need to fix.
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