diff --git a/2022/16/fast.js b/2022/16/fast.js
new file mode 100644
index 0000000..5357596
--- /dev/null
+++ b/2022/16/fast.js
@@ -0,0 +1,4 @@
+import part1, { sample, puzzleInput } from "./part1.js";
+import part2 from "./part2.js";
+
+console.log(part2(puzzleInput));
diff --git a/2022/16/part2.js b/2022/16/part2.js
index 441d100..1c649cb 100644
--- a/2022/16/part2.js
+++ b/2022/16/part2.js
@@ -4,71 +4,69 @@ import u from 'updeep';
 
 import { buildGraph } from './part1.js';
 
-const findMaxSteam = (tunnels,graph) => (minutesLeft, unopened, opened, activeSteam, peeps ) => {
-    if (minutesLeft <= 0) return 0;
+const findMaxSteam = (tunnels,graph, minutesLeft, unopened, opened, activeSteam, peeps ) => {
 
-    if (unopened.length === 0) return minutesLeft * activeSteam;
+    console.log({ unopened, activeSteam, minutesLeft});
 
-    const next = R.first( R.sortBy(peeps, R.prop('eta')));
+    let next = R.sortBy(peeps, R.prop('eta'));
 
-    if( next.eta >)
+    if( next[0].eta > minutesLeft ) {
+        return minutesLeft * activeSteam;
+    }
+
+    const delta = next[0].eta;
+    const location = next[0].destination;
+
+    const base = delta * activeSteam;
+    minutesLeft -= delta;
+
+    activeSteam += tunnels[ next[0].destination ].flow;
+    opened = [ ...opened, next[0].destination ];
+
+    next = u.updateIn( '1.eta', eta => eta - delta, next );
+
+    const scores = [];
 
 
 
 
-}
+    let nothing = true;
+    for ( const destination of unopened ) {
+        const path = bidirectional(graph, location, destination );
 
-function finalSteam(tunnels, graph, minutesLeft, possibilities, locations, activeSteam = 0) {
-
-
-
-    const nextToGo = locations.filter(([time]) => !time);
-
-    for( const l of locations) {
-        if( l[0] === 0 ) {
-            activeSteam += l[2];
-            l[2] = 0;
+        if( path.length > minutesLeft) {
+            continue;
         }
+        nothing = false;
+
+        next = u.updateIn( '0', {
+            location,
+            eta: path.length,
+            destination 
+        },next);
+
+        scores.push( findMaxSteam(tunnels,graph,minutesLeft,
+            unopened.filter( x => x !== destination ),
+            opened, activeSteam, next
+        ) );
     }
 
+    if( nothing ) {
+        next = u.updateIn( '0', {
+            location,
+            eta: 999,
+            destination: 'END',
+        },next);
 
-    let scores = [];
-
-    for ( const ntg of nextToGo ) {
-
-    for ( const next of possibilities ) {
-        const path = bidirectional(graph, ntg[1], next);
-        
-    //console.log(path);
-        
-    const locs = locations.map( x => x === ntg ? [
-        path.length, next, tunnels[next].flow
-    ] : x );
-
-    let time = Math.min( ...locs.map( ([time]) => time ) );
-
-    if (time >= minutesLeft) {
-        //console.log(minutesLeft, activeSteam, locations, possibilities);
-            scores.push( minutesLeft * activeSteam );
-    }
-    else {
-        //console.log({totalSteam, time, activeSteam});
-        let ts = time * activeSteam;
-
-        scores.push(
-                ts + finalSteam(
-                    tunnels, graph, minutesLeft - time,
-                    possibilities.filter( x => x !== next ),
-                    locs.map( ([t,dest,s] ) => [ t -time, dest,s ]),
-                    activeSteam
-                )
-        )
+        scores.push( findMaxSteam(tunnels,graph,minutesLeft,
+            unopened,
+            opened, activeSteam, next
+        ) );
     }
 
-    }
-            }
+    return base + Math.max( ...scores );
+
 
-    return Math.max( ...scores );
 }
 
 export default (tunnels) => {
@@ -80,9 +78,9 @@ export default (tunnels) => {
 
     const graph = buildGraph(tunnels);
 
-    return  finalSteam(tunnels, graph, 26, possibilities, [
-        [ 0, 'AA',0 ],
-        [ 0, 'AA',0 ]
-    ], 0, 0)
+    return  findMaxSteam(tunnels, graph, 26, possibilities,[],0, [
+        { destination: 'AA', eta: 0 },
+        { destination: 'AA', eta: 0 },
+    ])
 
 };
diff --git a/2022/16/test.js b/2022/16/test.js
index 14f8d9d..44c122e 100644
--- a/2022/16/test.js
+++ b/2022/16/test.js
@@ -17,7 +17,7 @@ describe("part 1", () => {
   test("sample", () => {
     expect(part1(sample)).toEqual(1651);
   });
-  test.only("solution", () => {
+  test("solution", () => {
         const r= part1(puzzleInput);
         expect(r).toBeGreaterThan(707);
     expectSolution(part1(puzzleInput)).toEqual(1871);
@@ -25,10 +25,10 @@ describe("part 1", () => {
 });
 
 describe.only("part 2", () => {
-  test("sample", () => {
+  test.skip("sample", () => {
     expect(part2(sample)).toEqual(1707);
   });
-  test.todo("solution", () => {
+  test("solution", () => {
     expectSolution(part2(puzzleInput)).toEqual("TODO");
   });
 });
diff --git a/package.json b/package.json
index 86b09f3..b49046c 100644
--- a/package.json
+++ b/package.json
@@ -12,13 +12,19 @@
   "license": "ISC",
   "dependencies": {
     "@a-robu/victor": "^2.2.2",
+    "@yanick/vyktor": "link:../vyktor",
+    "combinatorial-generators": "^1.1.2",
     "debug": "^4.3.4",
     "fs-extra": "^11.1.0",
+    "graphology": "^0.25.1",
+    "graphology-shortest-path": "^2.0.1",
+    "graphology-types": "^0.24.5",
     "memoizerific": "^1.11.3",
     "prettier": "^2.8.0",
     "remeda": "^1.3.0",
-    "vite": "^4.0.1",
-    "vitest": "0.25.7"
+    "updeep": "^1.2.1",
+    "vite": "4.0.3",
+    "vitest": "0.26.3"
   },
   "devDependencies": {
     "@vitest/ui": "^0.25.8"