Submerged rusted cargo ship wreck underwater shadow stealth casual puzzle game. Players travel between connected sunken cabin nodes scattered across flooded hull corridors. Bright rippling sunlight refracts through ocean waves above deck, creating wide shimmering light bands that fill open water spaces. Only thick metal hull shadow blocks the refracted light and provides safe movement nodes. Entering shimmering sunlit water bands 3 times triggers automatic round failure. Harder difficulty tiers feature sparse narrow light gaps at first, then large continuous reflective surface light sheets, plus multi-compartment split hull layouts with disconnected shadow pockets. Muted deep blue underwater wreck atmospheric visuals with tap adjacent-node navigation mechanics for tense aquatic stealth route planning.