1984 - Oernst Of Life
1985 - Starlight, Murderer, Warrior, Victim Of Fate, Cry For Freedom - from the Helloween EP
1986 - Judas
1987 - Savage, Livin' Ain't No Crime
1988 - Save Us, Don't Run For Cover
1991 - Shit And Lobster, Les Hambourgeois Walkways (Instrumental), You Run With The Pack
1993 - I Don't Care, You Don't Care, Oriental Journey (Instrumental), Cut In The Middle, Get Me Out Of Here, Red Socks And The Smell Of Trees (Instrumental), Ain't Got Nothing Better
1994 - Can't Find Your Desire, Grapowski's Malmsuite 1001 (In D Doll) (Instrumental), Star Invasion, Silicon Dreams
1996 - Still I Don't Know, Take It To The Limit, Walk Your Way, Light In The Sky, Time Goes By
1998 - Back On The Ground, A Game We Shouldn't Play
2000 - The Madness Of The Crowds, Deliver Us From Temptation
2003 - Far Away
2005 - Revolution
2007 - We Unite, Find My Freedom, See The Night, Never Surrender
2010 - I'm Free, Faster We Fall, Aiming High
2013 - Another Shot Of Life, No Eternity
2015 - I Wish I Were There, Wicked Game, Free World, Nightmare, More Than A Lifetime
2021 - Pumpkins United (released in 2017... bonus song to the Helloween album), Golden Times, Save My Hide, We Are Real
*there's one song from 1998 named Moshi Moshi~Shiki No Uta - at first it's a live drum solo and then after it the original instrumental song starts (also live) - this instrumental part can be found as a full song in Gamma Ray song ''One With The World'' from their 1991 album.
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53 songs in total! (19 of them are solely written by Markus Grosskopf - he is a great songwriter).
There are some pretty good songs which (IMO) should have been added to their respective albums. My favorites are: Deliver Us From Temptation, Revolution, We Unite, Save Us, the whole EP, Judas and of course, Pumpkins United.