These are all the stages which can be unlocked by downloading the Secret Songs APK file from Master Tiles' YouTube channel.

Secret songs unlocked by LevelEdit

Number Stage Name
S1 Little Star (Beta)
S2 Bengawan Solo
S3 Die Forelle
S4 Yearn
S5 Sonata Pathetique Mvt. 3 (Original Beethoven version)
S6 Etude Op. 10 No. 1
S7 Murmuring Zephyrs P. 190
S8 Gnomenreigen
S9 Jasmine (Secret version)
S10 Etude Op. 13 No. 2
S11 Katyusha
S12 Heidenroslein (Extended)
S13 Etude Op. 740 No. 14
S14 Cancan (Full Version)
S15 Mary Had a Little Lamb
S16 Golden Melody
S17 Nocturne Op. 9 No. 2 (Full Version)
S18 Finnish Polka
S19 Mexican Hat Dance
S20 She'll Be Coming 'Round The Mountain
S21 Canon (Full Version)
S22 Catch The Lotch
S23 Recuerdos de la Alhambra
S24 Unknown 1
S25 Unknown 2
S26 Unknown 3
S27 Unknown 4
S28 Unknown 5
S29 Unknown 6
S30 Unknown 7
S31 Modlitwa Dziewicy (Full Version)
S32 Nobody Know The Trouble I've Seen
S33 Pluck Tea
S34 Scarbrough Fair
S35 Preamble
S36 Songs Without Words Op. 62 No. 6
S37 Moonlight Sonata Mvt. 1 (Extended)

Secret songs unlocked by purchaseEdit

Number Stage Name
SP1 Do You Ears Hang Low
SP2 Malan Flowers
SP3 Flight of the Bumblebee (Extended)
SP4 Manual of Youth
SP5 Sarabande
SP6 Ievan Polkka (Actual Version)
SP7 Little New Year Greetings
SP8 Symphony No. 5 Mvt. 1 (Full Version)
SP9 Moonlight Sonata Mvt. 2 (Extended)
SP10 Symphony No. 40 in g (Extended)
SP11 Etude Op. 10 No. 3 (Full Version)
SP12 Magnificat No. 2
SP13 Rosamunde D 797 Entr'acte No. 3