Who is hiding in the basement? What kinds of horrors are waiting for you down there, in the darkness? A small boy ventures into the unknown to fight mortal dangers and save his family from the curse that is hanging over it. There are plenty of surprises and threats waiting for you in the twilight. Explore numerous levels, find gold and powerups, use magical weapons to defeat your enemies and fight powerful bosses on each floor playing Binding of Isaac 2 online!