From RemyWiki

What Is And What Isn't A Clear

There is occasionally some confusion over what counts as a cleared song.

As a general rule, if the game shows you a status indicator showing it's cleared, you can count it as a cleared. The exceptions to this rule is 3rd & 4th Style CS, where a clear on an expert course will improperly mark the songs as cleared.

Accomplishments That Are Clears

• Songs passed in Arcade Mode.
• Songs passed in Free Mode.
• Songs passed with the Hard modifier in Arcade Mode or Free Mode.
• Songs passed with the Easy modifier in Arcade Mode or Free Mode.
• Songs passed with the Random modifier in either Arcade Mode or Free Mode.
• Songs passed with the S-Random modifier in either Arcade Mode or Free Mode on Happy Sky or DistorteD.
• Getting a higher failing score on a song you've previously passed.
• Songs passed with an FC played during an Expert Course or Dan Course.

Things That Aren't Clears

• Songs passed in Expert Mode.
• Songs passed in Master Mode.
• Songs passed in Beginner Mode.
• Songs passed in Dan/Class Mode.
• Songs passed in Training Mode.
• Songs passed with the Autoscratch modifier.
• Songs passed with the 5-Key modifier.
• Songs passed with the S-Random modifier in either Arcade Mode or Free Mode in styles other than the aforementioned.
• Songs passed with a game difficulty set less than the default (in Options mode).