How do you get to casle of ruins 1F on valhalla knight?

To reach the Castle of Ruins 1F in Valhalla Knight, you need to navigate through the game's earlier areas, defeating enemies and acquiring necessary items. Look for paths that lead upward and explore all available routes to find the entrance. Pay attention to any environmental clues or map markers that guide you. Once you locate the entrance, proceed inside to access the 1F.