Rhythm Shiryo Shitsu

The Rhythm Shiryo Shitsu (リズム資料室) is a section in Rhythm Tengoku which contains various things to read, obtainable by achieving a Perfect on certain Rhythm Games. This feature was succeeded by the Reading Material in Rhythm Heaven and Rhythm Heaven Fever, and the Rhythm Items in Rhythm Heaven Megamix.

リズム天国へようこそ！ (Welcome to Rhythm Tengoku!)
Available from the start of the game.

取り扱い説明書 (Instruction Manual)
Available from the start of the game.

経営者に聞く (From the Manager)
Obtained as the Gift in Remix 4.

毛ぬき投書 (Epilation Letter)
Obtained as the Gift in Rhythm Datsumo.

ナイトウォーク情報 (Night Walk Information)
Obtained as the Gift in Night Walk 2. ''Note: The five numbers correspond to the individual characters of Play-Yan's name (PU-RE-I-YA-N). This translation attempts to match the numbers to the original positions as close as possible.''

エアーバッター速報 (Air Batter Report)
Obtained as the Gift in Spaceball.

うまマシーン開発秘話 (The Secret Story of Uma Machine's Development)
Obtained as the Gift in Air Batter 2.

マーチャ活動記録 (Marcher Activity Log)
Obtained as the Gift in Tram to Poline.

とあるラジオ番組 (A Certain Radio Program)
Obtained as the Gift in Rap Men.

歌詞カード① (Lyrics Card 1)
Obtained as the Gift in Remix 2.

歌詞カード② (Lyrics Card 2)
Obtained as the Gift in Polyrhythm.

歌詞カード③ (Lyrics Card 3)
Obtained as the Gift in Rap Women.

さいごの通達 (Final Letter)
Obtained as the Gift in Remix 8.

忍者の巻物 (Ninja Scroll)
Obtained as the Gift in Ninja no Shison.

リズム漫才 (Rhythm Manzai)
Obtained as the Gift in Toss Boys 2.

よろこびの声 (Voices of Joy)
Obtained as the Gift in Remix 7.

わかる！リズムの公式 (Understand! Rhythm Formula)
Obtained as the Gift in Quiz Show.

リズム感タイプ診断 (Sense of Rhythm Type Diagnosis)
Obtained by getting a perfect in Sick Beats.

リズムポエム集 (Rhythm Poem Collection)
Obtained as the Gift in Mahou Tsukai.

リズム俳句集 (Rhythm Haiku Collection)
Obtained as the Gift in Hanabi.

Trivia

 * An unused notification screen for Rhythm Shiryo Shitsu exists, which can be seen in the debug menu. Selecting it causes the game to show that a letter has arrived, with the background depicting a library. The player can choose "Yes" to read the letter immediately, or "No" to return to the previous menu.
 * While navigating the menu, the person in the corner can be seen using the mouse as if selecting the letters. If the player waits on the menu, that person will fall asleep.
 * Each letter has a set background and audio track when reading it. One of the tracks resembles the track from Kokuhaku Machine, however after a while, the music slows down and eventually stops. Someone can then be heard turning a key, before the music starts again.
 * Although this feature is absent from the arcade game, the music for it was repurposed for the "Continue?" countdown screen if the player loses all hearts during a Stage.