diff --git a/Days/Day16.cs b/Days/Day16.cs
new file mode 100644
index 0000000..3a36a9b
--- /dev/null
+++ b/Days/Day16.cs
@@ -0,0 +1,219 @@
+using Spectre.Console;
+
+namespace AdventOfCode.Days;
+
+public class Valve
+{
+    public string Name { get; }
+    public int Rate { get; }
+    public IList<Valve> AccessibleValves { get; }
+
+    public Valve(string name, int rate)
+    {
+        Name = name;
+        Rate = rate;
+        AccessibleValves = new List<Valve>();
+    }
+}
+
+public record ValvePath(int CurrentMinute, int PressurePerMinute, int ReleasedPressure, Valve CurrentValve, HashSet<Valve> OpenedValves);
+
+public class Day16 : Day
+{
+    public override int Number => 16;
+    public override string Name => "Proboscidea Volcanium";
+    public override void RunPart1(bool display = true)
+    {
+        var startValve = ParseValves();
+
+        // Test all possibles paths
+        int maxPressure = 0;
+        var paths = new Queue<ValvePath>();
+        paths.Enqueue(new ValvePath(1, 0, 0, startValve, new HashSet<Valve>()));
+
+        // Remember best pressure at each valve
+        var valvePotential = new Dictionary<Valve, (int currentMinute, int potential)>();
+
+        while (paths.Count > 0)
+        {
+            var state = paths.Dequeue();
+
+            // Check if this state is worse than last one at this same valve
+            int potential = state.ReleasedPressure + (30 - state.CurrentMinute + 1) * state.PressurePerMinute;
+            if (valvePotential.TryGetValue(state.CurrentValve, out var lastState))
+            {
+                if (state.CurrentMinute >= lastState.currentMinute)
+                {
+                    if (potential <= lastState.potential)
+                    {
+                        continue;
+                    }
+                }
+            }
+            
+            valvePotential[state.CurrentValve] = (state.CurrentMinute, potential);
+
+            // Release pressure at start of minute
+            var newPressure = state.ReleasedPressure + state.PressurePerMinute;
+
+            // Compute new max
+            if (newPressure > maxPressure)
+            {
+                maxPressure = newPressure;
+            }
+
+            // Stop at minute 30
+            if (state.CurrentMinute == 30)
+            {
+                continue;
+            }
+            
+            // Check if the valve can be opened
+            if (!state.OpenedValves.Contains(state.CurrentValve))
+            {
+                // New state with current valve opened
+                var openedValves = new HashSet<Valve>(state.OpenedValves);
+                openedValves.Add(state.CurrentValve);
+                
+                paths.Enqueue(new ValvePath(state.CurrentMinute + 1, state.PressurePerMinute + state.CurrentValve.Rate, newPressure, state.CurrentValve, openedValves));
+            }
+
+            // Move to all accessible valves
+            foreach (var accessibleValve in state.CurrentValve.AccessibleValves)
+            {
+                paths.Enqueue(new ValvePath(state.CurrentMinute + 1, state.PressurePerMinute, newPressure, accessibleValve, state.OpenedValves));
+            }
+        }
+
+        if (display)
+        {
+            AnsiConsole.MarkupLine($"[green]Max pressure released: [yellow]{maxPressure}[/][/]");
+        }
+    }
+
+    public override void RunPart2(bool display = true)
+    {
+        throw new NotImplementedException();
+    }
+
+    private static Valve ParseValves()
+    {
+        var valves = new Dictionary<string, Valve>();
+
+        // Create valves first
+        foreach (var line in Input.ReadAllLines())
+        {
+            var span = line.AsSpan();
+
+            var nameStart = span.IndexOf(' ') + 1;
+            var name = span[nameStart..(nameStart + 2)].ToString();
+
+            var rateStart = span.IndexOf('=') + 1;
+            var rateEnd = span.IndexOf(';');
+
+            var rate = int.Parse(span[rateStart..rateEnd]);
+
+            valves.Add(name, new Valve(name, rate));
+        }
+
+        // Add links
+        // Create valves first
+        foreach (var line in Input.ReadAllLines())
+        {
+            var span = line.AsSpan();
+
+            var nameStart = span.IndexOf(' ') + 1;
+            var name = span[nameStart..(nameStart + 2)].ToString();
+
+            var valve = valves[name];
+
+            var valvesStart = span.IndexOf(',') != -1 ? span.IndexOf(',') - 2 : span.Length - 2;
+            var valvesToAdd = span[valvesStart..].ToString().Split(", ").Select(v => valves[v]);
+
+            foreach (var valveToAdd in valvesToAdd)
+            {
+                valve.AccessibleValves.Add(valveToAdd);
+            }
+        }
+
+        return valves["AA"];
+    }
+
+    #region Input
+
+    public const string ExampleInput =
+    """
+    Valve AA has flow rate=0; tunnels lead to valves DD, II, BB
+    Valve BB has flow rate=13; tunnels lead to valves CC, AA
+    Valve CC has flow rate=2; tunnels lead to valves DD, BB
+    Valve DD has flow rate=20; tunnels lead to valves CC, AA, EE
+    Valve EE has flow rate=3; tunnels lead to valves FF, DD
+    Valve FF has flow rate=0; tunnels lead to valves EE, GG
+    Valve GG has flow rate=0; tunnels lead to valves FF, HH
+    Valve HH has flow rate=22; tunnel leads to valve GG
+    Valve II has flow rate=0; tunnels lead to valves AA, JJ
+    Valve JJ has flow rate=21; tunnel leads to valve II
+    """;
+
+    public const string Input =
+    """
+    Valve JI has flow rate=21; tunnels lead to valves WI, XG
+    Valve DM has flow rate=3; tunnels lead to valves JX, NG, AW, BY, PF
+    Valve AZ has flow rate=0; tunnels lead to valves FJ, VC
+    Valve YQ has flow rate=0; tunnels lead to valves TE, OP
+    Valve WI has flow rate=0; tunnels lead to valves JI, VC
+    Valve NE has flow rate=0; tunnels lead to valves ZK, AA
+    Valve FM has flow rate=0; tunnels lead to valves LC, DU
+    Valve QI has flow rate=0; tunnels lead to valves TE, JW
+    Valve OY has flow rate=0; tunnels lead to valves XS, VF
+    Valve XS has flow rate=18; tunnels lead to valves RR, OY, SV, NQ
+    Valve NU has flow rate=0; tunnels lead to valves IZ, BD
+    Valve JX has flow rate=0; tunnels lead to valves DM, ZK
+    Valve WT has flow rate=23; tunnels lead to valves OV, QJ
+    Valve KM has flow rate=0; tunnels lead to valves TE, OL
+    Valve NG has flow rate=0; tunnels lead to valves II, DM
+    Valve FJ has flow rate=0; tunnels lead to valves AZ, II
+    Valve QR has flow rate=0; tunnels lead to valves ZK, KI
+    Valve KI has flow rate=9; tunnels lead to valves ZZ, DI, TL, AJ, QR
+    Valve ON has flow rate=0; tunnels lead to valves LC, QT
+    Valve AW has flow rate=0; tunnels lead to valves DM, AA
+    Valve HI has flow rate=0; tunnels lead to valves TE, VC
+    Valve XG has flow rate=0; tunnels lead to valves II, JI
+    Valve II has flow rate=19; tunnels lead to valves LF, NG, OL, FJ, XG
+    Valve VC has flow rate=24; tunnels lead to valves WI, HI, AZ
+    Valve VJ has flow rate=0; tunnels lead to valves UG, AA
+    Valve IZ has flow rate=0; tunnels lead to valves VF, NU
+    Valve EJ has flow rate=0; tunnels lead to valves ZK, LC
+    Valve DU has flow rate=12; tunnels lead to valves TC, UG, FM
+    Valve ZK has flow rate=10; tunnels lead to valves JX, EJ, JW, QR, NE
+    Valve XF has flow rate=25; tunnels lead to valves OP, VT
+    Valve LC has flow rate=4; tunnels lead to valves FM, EJ, ON, AJ, PF
+    Valve SV has flow rate=0; tunnels lead to valves XS, IY
+    Valve LF has flow rate=0; tunnels lead to valves II, OV
+    Valve DI has flow rate=0; tunnels lead to valves KI, BY
+    Valve OP has flow rate=0; tunnels lead to valves YQ, XF
+    Valve NQ has flow rate=0; tunnels lead to valves TC, XS
+    Valve QJ has flow rate=0; tunnels lead to valves VT, WT
+    Valve IY has flow rate=22; tunnel leads to valve SV
+    Valve AJ has flow rate=0; tunnels lead to valves LC, KI
+    Valve TE has flow rate=11; tunnels lead to valves QI, HI, KM, YQ
+    Valve ZZ has flow rate=0; tunnels lead to valves KI, AA
+    Valve VT has flow rate=0; tunnels lead to valves XF, QJ
+    Valve OL has flow rate=0; tunnels lead to valves KM, II
+    Valve TC has flow rate=0; tunnels lead to valves NQ, DU
+    Valve TL has flow rate=0; tunnels lead to valves VF, KI
+    Valve QT has flow rate=0; tunnels lead to valves AA, ON
+    Valve BY has flow rate=0; tunnels lead to valves DM, DI
+    Valve OV has flow rate=0; tunnels lead to valves LF, WT
+    Valve VN has flow rate=0; tunnels lead to valves RR, BD
+    Valve VF has flow rate=13; tunnels lead to valves OY, IZ, TL
+    Valve BD has flow rate=17; tunnels lead to valves NU, VN
+    Valve UG has flow rate=0; tunnels lead to valves VJ, DU
+    Valve PF has flow rate=0; tunnels lead to valves LC, DM
+    Valve RR has flow rate=0; tunnels lead to valves XS, VN
+    Valve AA has flow rate=0; tunnels lead to valves QT, ZZ, AW, VJ, NE
+    Valve JW has flow rate=0; tunnels lead to valves ZK, QI
+    """;
+
+    #endregion
+}
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