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Some Sonic fangame i can't find with name "Sonic F" or "Sonic H" or along those lines

pleasefindthisgameibeg

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Oct 27, 2020
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So I'm trying to find an older sonic fangame around 2007 to 2014 or so, it's an advance style 2d sonic fangame with custom character support. (I remember this because there was a Mario and Luigi Custom Character with their own voice clips and moveset.) its name is Sonic followed by a letter in the alphabet like Sonic G or J or K or L and so on and no, I can't remember the letter it was at the end. Worst of all, Youtube Search is not helping me find this game at all. If it's there, It's buried under all kinds of sonic content. if anyone knows what game I'm talking about please send any info you have to me. I've searched all over.