Sonic 1 with jam layouts and features wrapped up in a nice options menu
The Main features:
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includes Revision 00, Revision 01, Easy and Original Layouts. (Original is just Revision 01 but with a fix to prevent jumping over the level in SLZ2.)
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Can enable or disable the level order for easy mode separately from Easy mode itself. (Easy mode has files for every level, unsure if they're different from normal I never checked)
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Can enable or disable the spindash
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Same with Time Overs
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switch bug behavior between original and Jam's (or S2 I guess)