Aqua Fish Rush

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Aqua Fish Rush is an endless 2D side-scrolling runner set underwater, running in the browser without installation. You control a small fish moving automatically from left to right through a scrolling ocean environment. Hostile fish, jellyfish, and coral formations appear in patterns that require you to tap or click to swim upward and release to sink, similar to a flap mechanic. Speed increases on a continuous curve, roughly doubling by the 90-second mark compared to the starting pace. The score counter ticks up every second of survival plus a bonus for each enemy passed without touching it. Every 500 points a brief checkpoint flash occurs and the background palette shifts to indicate a new depth zone with different obstacle sets. There are five distinct zone themes including shallow reef, open ocean, and deep trench. No lives or continues exist; any collision ends the run and posts your score. A leaderboard tracks top scores for competitive replay.