| rowspan="4" style="text-align:center;"|'''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-2 on hard, you must complete E-1 on normal or hard.)
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| rowspan="2" style="text-align:center;"|'''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-2 on hard, you must complete E-1 on normal or hard.)