Heroes of Might and Magic III
The last one is a toss-up between Commandos Behind Enemylines, HOMM II and Legend Of Grimrock. But it's only for the 5th place so who cares.
Worthy runner-ups: To The Moon, Commandos 2, Painkiller, and Broken Sword. Also, games that might have made the list based on what people have said, but I haven't played yet (but I will): The Witcher and Sacrifice
Does my list count as cheating?