Hold the pressure.
HydroValve is a pipe-routing puzzle under real pressure. Build your route from transparent pipes that stay empty while you work — trace the flow in your head, then open the valve and pray you traced it right. Every leak drains the same shared tank. At 0%, the run is over.
Forty-six seconds of pressure.
Rules in a minute. Depth for months.
Trace it blind
Pipes stay empty while you build. The puzzle isn't placing them — it's knowing, before the valve opens, that your route holds.
Three modes
Survival races a build clock that opens the valve for you. Challenge hands you sabotaged plumbing to fix. Campaign descends through six facilities where the valve, once open, never shuts.
Living machinery
Treatment units scrub fouled water, gate valves ship shut, welded faults resist repair, and cracked floors bleed your reserve. Deep levels stack all of it at once.
World records
Every run can post to a live worldwide leaderboard — three letters, your level, your time. No accounts, no sign-up.