Hold the Levee is a strategy simulation game focused on real-time fluid dynamics and water physics. Players must dig trenches, raise levees, stack sandbags, and build dams, then watch how the water reacts to the structures. The gameplay simulates realistic water behaviors such as seepage, undermined walls, flood waves, and ice jams across 24 unique missions. The campaign ranges from defending a town from natural disasters to flooding enemy villages guarded by the AI. The game also includes a sandbox map editor, local or online co-op, and a unique 1v1 "Water vs Defender" PvP mode.