Icons

Icon (アイコン) rarity ranges from 1 (★☆☆☆) to 4 (★★★★).

Icon name translations are best-effort. Corrections are welcome.

Stage Up
Clear Stage xyz to unlock icon "ステージアップ『xyz』制覇" (Stage Up xyz conquered). The icons simply show the corresponding stage number. There are 13 in total. I'm too lazy to list all of them.

All Charts of a Song
Clear all charts (Normal, Hard, Expert) of one of the following songs to unlock its corresponding icon. The icons share the name of the song, and show the song's cover. I'm too lazy to put them into a table.

Rarity 1: Rarity 2:
 * Rainbow Dream
 * Knight Rider
 * Poseidon
 * PARALLEL★PRISM
 * MEMORiZE
 * illanai-assorted
 * Soldiers
 * Fight for the CORE feat. Daisuke
 * Let you DIVE！
 * LEVATEiN feat. 野宮あゆみ
 * BIG HEAD BANGING
 * Quon
 * HELL FLAME
 * Gate One
 * Are You Ready
 * Over My Hand
 * Exitium
 * ATARAX1A
 * 13 DONKEYS
 * ADAM
 * Chariot
 * HiGHER
 * GRiDGALAXY
 * BOOM! BOOM!! BOOM!!!
 * Sound Chimera
 * Sunshine
 * Invisible Frenzy
 * JINGLE DEATH
 * Murasaki
 * Mazy Metroplex

Limited
These icons were only available on a special occasion and may be now impossible to unlock.