| rowspan=2|'''In order to play these maps on hard, you must complete the previous map on either normal or hard.'''<br/> ''(e.g., to do E-3 on hard, you must complete E-2 on normal or hard.)''
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| rowspan=2|'''In order to play these maps on hard, you must complete the previous map on either medium or hard.'''<br>''(e.g., to do E-3 on hard, you must complete E-2 on medium or hard.)''