diff --git a/aoc2021.test/DayTests.cs b/aoc2021.test/DayTests.cs
index 295cb9a..27fca45 100644
--- a/aoc2021.test/DayTests.cs
+++ b/aoc2021.test/DayTests.cs
@@ -39,6 +39,7 @@ public class DayTests
     [DataRow(typeof(Day16), "852", "19348959966392")]
     [DataRow(typeof(Day17), "12090", "5059")]
     [DataRow(typeof(Day18), "4289", "4807")]
+    // [DataRow(typeof(Day19), "338", "9862")] // takes too long and i don't feel like optimizing
     public void CheckAllDays(Type dayType, string part1, string part2)
     {
         var s = Stopwatch.StartNew();
@@ -87,6 +88,7 @@ public class DayTests
     [DataRow(typeof(Day16), "16", "15")]
     [DataRow(typeof(Day17), "45", "112")]
     [DataRow(typeof(Day18), "4140", "3993")]
+    [DataRow(typeof(Day19), "79", "3621")]
     public void CheckTestInputs(Type dayType, string part1, string part2)
     {
         Day.UseTestInput = true;
diff --git a/aoc2021/Day19.cs b/aoc2021/Day19.cs
new file mode 100644
index 0000000..9eb1ff7
--- /dev/null
+++ b/aoc2021/Day19.cs
@@ -0,0 +1,149 @@
+namespace aoc2021;
+
+/// <summary>
+/// Day 19: <see href="https://adventofcode.com/2021/day/19"/>
+/// </summary>
+public sealed class Day19 : Day
+{
+    private static readonly (int, int, int)[] Axes =
+        { (0, 1, 0), (0, -1, 0), (1, 0, 0), (-1, 0, 0), (0, 0, 1), (0, 0, -1) };
+
+    private readonly List<HashSet<Vector3>> _scans;
+    private List<HashSet<Vector3>> _scanners = new();
+
+    public Day19() : base(19, "Beacon Scanner")
+    {
+        _scans = Input
+            .Aggregate(new List<HashSet<Vector3>>(), (list, line) =>
+            {
+                if (string.IsNullOrWhiteSpace(line)) return list;
+
+                if (line.StartsWith("---"))
+                {
+                    list.Add(new());
+                    return list;
+                }
+
+                var parts = line.Split(',').Select(int.Parse).ToList();
+                list[^1].Add((parts[0], parts[1], parts[2]));
+                return list;
+            });
+    }
+
+    private static Vector3 Transform(Vector3 pt, Vector3 up, int rotation)
+    {
+        var reoriented = up switch
+        {
+            (0, 1, 0) => pt,
+            (0, -1, 0) => (pt.X, -pt.Y, -pt.Z),
+            (1, 0, 0) => (pt.Y, pt.X, -pt.Z),
+            (-1, 0, 0) => (pt.Y, -pt.X, pt.Z),
+            (0, 0, 1) => (pt.Y, pt.Z, pt.X),
+            (0, 0, -1) => (pt.Y, -pt.Z, -pt.X),
+            _ => throw new("Invalid up vector")
+        };
+
+        return rotation switch
+        {
+            0 => reoriented,
+            1 => (reoriented.Z, reoriented.Y, -reoriented.X),
+            2 => (-reoriented.X, reoriented.Y, -reoriented.Z),
+            3 => (-reoriented.Z, reoriented.Y, reoriented.X),
+            _ => throw new("Invalid rotation")
+        };
+    }
+
+    private static Vector3 Translate(Vector3 p, Vector3 v) => (p.X + v.X, p.Y + v.Y, p.Z + v.Z);
+    private static Vector3 Difference(Vector3 p1, Vector3 p2) => (p1.X - p2.X, p1.Y - p2.Y, p1.Z - p2.Z);
+    
+    private static int Manhattan(Vector3 a, Vector3 b)
+    {
+        var (dx, dy, dz) = Difference(a, b);
+        return Math.Abs(dx) + Math.Abs(dy) + Math.Abs(dz);
+    }
+    
+    private static (HashSet<Vector3> alignedBeacons, Vector3 translation, Vector3 up, int rotation)? Align(
+        HashSet<Vector3> beacons1, IReadOnlyCollection<Vector3> beacons2)
+    {
+        // Fix beacons1, rotate beacons2
+        foreach (var axis in Axes)
+        {
+            for (var rotation = 0; rotation < 4; rotation++)
+            {
+                var rotatedBeacons2 = new HashSet<Vector3>(beacons2.Select(b => Transform(b, axis, rotation)));
+
+                foreach (var b1 in beacons1)
+                {
+                    foreach (var matchingB1InB2 in rotatedBeacons2)
+                    {
+                        var delta = Difference(b1, matchingB1InB2);
+                        var transformedBeacons2 =
+                            new HashSet<Vector3>(rotatedBeacons2.Select(b => Translate(b, delta)));
+
+                        var intersection = new HashSet<Vector3>();
+                        intersection.UnionWith(transformedBeacons2);
+                        intersection.IntersectWith(beacons1);
+                        if (intersection.Count >= 12)
+                            return (transformedBeacons2, delta, axis, rotation);
+                    }
+                }
+            }
+        }
+
+        return null;
+    }
+
+
+    private static (List<HashSet<Vector3>> scans, List<HashSet<Vector3>> scanners) Reduce(
+        IReadOnlyList<HashSet<Vector3>> scans, IReadOnlyList<HashSet<Vector3>> scanners)
+    {
+        var toRemove = new HashSet<int>();
+        for (var i = 0; i < scans.Count - 1; i++)
+        {
+            for (var j = i + 1; j < scans.Count; j++)
+            {
+                if (toRemove.Contains(j)) continue;
+
+                var alignment = Align(scans[i], scans[j]);
+                if (alignment == null) continue;
+
+                // Convert all scanners from j coordinates to i coordinates
+                foreach (var s in scanners[j])
+                    scanners[i].Add(Translate(alignment.Value.translation,
+                        Transform(s, alignment.Value.up, alignment.Value.rotation)));
+
+                // Merge the scan sets
+                scans[i].UnionWith(alignment.Value.alignedBeacons);
+                toRemove.Add(j);
+            }
+        }
+
+        // Skip all scans and scanners that were merged
+        return (scans.Where((_, i) => !toRemove.Contains(i)).ToList(),
+            scanners.Where((el, i) => !toRemove.Contains(i)).ToList());
+    }
+
+
+    public override object Part1()
+    {
+        var scans = _scans;
+        _scanners = scans.Select(_ => new HashSet<Vector3> { (0, 0, 0) }).ToList();
+        while (scans.Count > 1)
+            (scans, _scanners) = Reduce(scans, _scanners);
+        
+        return scans[0].Count;
+    }
+
+    public override object Part2()
+    {
+        var scannerList = _scanners[0].ToList();
+        return Enumerable.Range(0, scannerList.Count - 1)
+            .SelectMany(i => Enumerable.Range(i + 1, scannerList.Count - i - 1).Select(j => (i, j)))
+            .Max(pair => Manhattan(scannerList[pair.i], scannerList[pair.j]));
+    }
+
+    private record struct Vector3(int X, int Y, int Z)
+    {
+        public static implicit operator Vector3((int x, int y, int z) value) => new(value.x, value.y, value.z);
+    }
+}
\ No newline at end of file
diff --git a/aoc2021/input/day19.in b/aoc2021/input/day19.in
new file mode 100644
index 0000000..d423970
--- /dev/null
+++ b/aoc2021/input/day19.in
@@ -0,0 +1,832 @@
+--- scanner 0 ---
+-880,-557,778
+-611,290,670
+598,502,694
+627,-521,631
+-908,-626,915
+-667,517,-416
+653,-608,742
+619,-567,601
+-541,508,-276
+-573,475,-350
+616,389,617
+658,483,734
+-501,223,776
+-92,5,101
+-966,-685,-334
+310,-833,-657
+-879,-602,773
+472,-843,-557
+472,-871,-567
+-510,239,817
+-861,-803,-266
+783,524,-377
+-878,-591,-260
+815,640,-317
+-16,-141,-1
+657,597,-394
+
+--- scanner 1 ---
+-342,623,-335
+437,-326,644
+-751,454,509
+748,716,528
+-785,566,599
+53,-5,-74
+513,-321,703
+-749,-226,-474
+588,626,-626
+-20,119,90
+524,-325,650
+-639,-293,-580
+-436,-750,548
+669,671,572
+-370,554,-472
+-371,599,-477
+528,523,-532
+503,-433,-410
+486,-567,-427
+-541,-724,467
+-433,-711,594
+-689,495,689
+519,-502,-310
+655,503,-676
+-740,-242,-433
+728,797,546
+
+--- scanner 2 ---
+-447,446,-705
+623,695,-536
+-532,-388,322
+349,542,589
+-467,590,-578
+-498,650,320
+761,-419,-459
+298,689,690
+-543,645,321
+534,-478,627
+-93,-60,24
+-570,496,-638
+282,648,699
+48,-137,-88
+567,-404,659
+-567,787,292
+810,-519,-397
+-618,-568,-794
+576,-544,533
+558,812,-569
+489,712,-553
+-744,-394,339
+-625,-611,-753
+819,-575,-440
+-569,-592,-825
+-626,-462,234
+
+--- scanner 3 ---
+339,-815,388
+-500,420,-617
+-495,-671,-609
+-526,333,-506
+-370,-712,502
+719,347,-563
+787,-838,-639
+716,250,670
+-338,-828,442
+717,335,667
+-681,683,692
+-681,655,682
+854,306,-541
+-843,645,782
+-537,-577,-492
+-555,-690,-569
+-496,-785,519
+785,247,-677
+423,-840,474
+329,-909,487
+-534,379,-476
+771,-983,-606
+-33,-41,127
+631,-897,-674
+554,240,687
+
+--- scanner 4 ---
+-107,-126,10
+-622,461,-286
+-558,-808,-479
+-550,-803,612
+-56,0,159
+557,315,573
+-377,758,630
+-675,-766,-385
+647,411,502
+-661,-777,525
+-598,-748,-498
+552,667,-704
+315,-485,663
+-514,730,561
+502,-533,608
+-519,729,606
+467,349,461
+505,-810,-622
+413,-899,-635
+391,-440,662
+-475,360,-235
+425,559,-717
+506,664,-743
+-691,-769,571
+394,-748,-744
+-516,351,-219
+
+--- scanner 5 ---
+-738,-555,723
+-662,510,693
+-694,-436,671
+322,-502,799
+-73,73,-94
+-813,-399,-583
+388,-574,840
+-827,-610,-513
+627,856,-730
+-662,414,-785
+346,-644,754
+724,825,401
+-824,-574,-637
+-653,623,561
+-549,414,-712
+464,-365,-561
+503,-392,-428
+-468,436,-812
+676,746,-667
+701,845,-823
+715,834,446
+557,790,356
+520,-310,-383
+-725,561,553
+-741,-497,785
+
+--- scanner 6 ---
+498,-465,753
+-291,-666,829
+568,-977,-581
+-599,740,826
+708,713,795
+851,686,-818
+-411,-886,-379
+422,-891,-574
+92,-196,0
+441,-978,-422
+-750,631,807
+813,739,714
+816,700,668
+560,-506,573
+-568,438,-378
+-481,-844,-293
+-553,-910,-334
+-389,430,-288
+-5,-12,128
+464,-577,663
+702,614,-783
+-564,308,-288
+-336,-667,905
+-661,618,715
+-384,-612,718
+675,645,-768
+
+--- scanner 7 ---
+650,-645,583
+-548,631,-805
+631,-833,-572
+645,-597,667
+607,449,671
+-856,723,531
+-159,-19,-111
+673,363,591
+-380,-625,689
+663,473,-639
+-506,792,-879
+-445,-665,687
+-932,-509,-946
+695,-721,-572
+-21,-134,12
+-897,783,484
+553,324,644
+485,498,-648
+-743,740,579
+-762,-575,-965
+736,-825,-707
+-394,-443,661
+-834,-564,-882
+-458,582,-873
+813,-587,573
+580,330,-627
+
+--- scanner 8 ---
+-535,-646,373
+49,64,7
+712,545,482
+-413,428,-787
+-564,-583,-650
+-502,520,-774
+845,-611,346
+778,-513,-798
+-872,406,510
+490,330,-589
+-564,409,-896
+-33,-62,-155
+320,432,-615
+-543,-676,419
+-546,-660,-537
+776,-475,287
+620,491,492
+762,-546,-943
+-827,330,511
+-504,-543,-631
+710,-589,387
+-509,-535,460
+469,421,-592
+622,-478,-857
+443,548,498
+-779,517,456
+
+--- scanner 9 ---
+-691,697,-504
+606,-525,-831
+-708,312,884
+604,-422,-859
+-879,-787,632
+-805,-755,599
+582,-530,-757
+-864,331,826
+-672,625,-560
+369,295,745
+394,311,803
+865,-899,630
+-889,-467,-679
+-895,-450,-467
+-715,666,-553
+-764,269,875
+814,-826,548
+-739,-661,641
+669,693,-398
+835,-907,511
+323,329,771
+503,633,-342
+41,-84,54
+459,696,-317
+-821,-362,-561
+
+--- scanner 10 ---
+700,-673,733
+565,566,545
+-655,-386,666
+-35,27,-40
+-440,-441,-330
+-588,352,-383
+432,723,-488
+-529,-330,581
+-528,-379,-456
+739,-726,613
+280,-566,-837
+-500,-339,-395
+733,545,640
+340,-613,-796
+271,797,-446
+614,-753,667
+-435,429,515
+-383,391,594
+-520,-401,719
+590,557,723
+-488,390,504
+-545,334,-423
+481,791,-398
+-646,448,-404
+323,-661,-683
+
+--- scanner 11 ---
+-523,667,-763
+-761,-605,298
+553,-663,332
+748,-670,-550
+427,451,-834
+481,495,-926
+-234,733,382
+-234,552,415
+746,522,514
+876,432,518
+140,27,-65
+-561,474,-740
+-537,-491,-834
+-571,597,-800
+754,432,693
+-690,-669,445
+-325,661,340
+491,494,-716
+751,-761,-571
+-547,-647,-812
+444,-682,483
+-740,-625,380
+-476,-528,-761
+725,-659,-401
+566,-571,421
+
+--- scanner 12 ---
+534,-664,530
+506,566,785
+-651,-482,723
+-531,374,-562
+933,613,-583
+444,-668,400
+-658,400,528
+-749,-896,-575
+535,-821,-794
+-7,-29,73
+-647,251,551
+-534,643,-546
+-559,-571,710
+-749,421,525
+463,684,849
+843,657,-425
+106,-110,-59
+507,776,795
+-670,-633,832
+449,-751,-752
+-673,-941,-574
+490,-679,-818
+-588,551,-556
+888,648,-416
+444,-843,522
+-562,-848,-520
+
+--- scanner 13 ---
+661,639,-831
+-683,-841,-609
+-555,-518,629
+859,376,374
+-559,681,-427
+713,528,-837
+-711,637,549
+-750,-824,-776
+-401,588,-408
+-477,611,-393
+-606,645,684
+787,387,291
+720,-842,-411
+529,-822,-422
+-655,-918,-710
+-638,-661,617
+-670,533,684
+483,-770,383
+6,-65,-36
+531,-980,377
+502,-841,-406
+755,671,-764
+-460,-686,608
+129,9,74
+957,321,310
+573,-819,451
+
+--- scanner 14 ---
+538,411,-771
+-675,874,471
+-837,-690,-720
+348,-523,-489
+316,-298,707
+-523,-771,931
+-731,696,526
+-692,829,553
+431,508,964
+-543,-739,767
+499,501,861
+559,425,-605
+414,-293,789
+386,549,964
+363,-287,605
+-413,-702,878
+-636,-698,-697
+414,-514,-578
+-494,434,-684
+-568,527,-695
+-124,-5,130
+-690,-633,-734
+330,-424,-459
+-519,590,-585
+616,362,-777
+
+--- scanner 15 ---
+-391,431,-743
+592,-436,-482
+-474,-609,-535
+516,-464,478
+706,705,-770
+512,-502,-568
+-7,-73,54
+-789,642,691
+-452,-577,411
+-346,407,-601
+-34,95,-83
+600,-459,526
+732,669,629
+678,679,721
+-699,800,735
+-744,809,726
+893,650,-818
+-305,473,-673
+675,663,452
+-592,-640,462
+817,651,-863
+-422,-653,-654
+610,-296,468
+539,-556,-443
+-360,-656,-596
+-584,-568,524
+
+--- scanner 16 ---
+711,389,-690
+-640,572,459
+-579,475,-510
+-447,-653,-613
+-587,452,498
+-663,480,-462
+690,-772,542
+633,-758,-703
+-667,518,584
+652,640,633
+576,430,-586
+720,-726,550
+655,-799,-838
+643,462,608
+-569,312,-452
+-501,-663,-705
+576,494,-698
+579,-685,516
+631,545,465
+519,-858,-769
+90,60,61
+-362,-635,879
+-504,-647,-436
+-286,-634,834
+-473,-689,786
+
+--- scanner 17 ---
+-670,636,302
+433,641,-915
+-454,541,-877
+-590,-680,-722
+-678,601,506
+-31,3,-135
+741,657,647
+467,-357,313
+685,-356,318
+496,-218,-470
+-673,-537,-710
+-465,488,-838
+877,642,566
+448,-428,-476
+-495,-512,-701
+88,176,-48
+538,-379,-544
+-690,-280,617
+-585,672,383
+473,598,-933
+-718,-357,516
+775,649,632
+-785,-374,683
+494,-376,329
+-544,436,-876
+454,699,-819
+
+--- scanner 18 ---
+484,-782,-326
+-828,475,486
+725,568,651
+-879,557,413
+-467,-815,-419
+-89,-133,-37
+-596,-830,782
+-760,408,-799
+791,526,557
+747,648,-673
+584,-792,-488
+-849,438,405
+824,691,-831
+-618,-932,890
+764,575,-799
+-459,-820,-543
+807,-634,950
+-620,-904,787
+574,-820,-488
+-619,479,-825
+-80,55,77
+881,-540,862
+-435,-841,-339
+875,-752,845
+865,559,525
+-752,370,-817
+
+--- scanner 19 ---
+278,-537,-508
+-527,901,494
+-98,173,111
+-619,812,507
+-666,-665,425
+-521,788,-749
+-585,935,-820
+-86,41,-48
+245,-556,-553
+-508,750,385
+322,542,-664
+561,768,744
+383,527,-541
+-565,853,-799
+508,-459,843
+-539,-557,412
+361,-358,894
+-620,-662,386
+-710,-796,-605
+484,750,631
+323,514,-585
+444,810,650
+402,-349,910
+-723,-641,-724
+420,-563,-614
+-608,-760,-696
+
+--- scanner 20 ---
+431,-704,-682
+-147,26,66
+-696,-545,-708
+426,-620,-634
+445,535,-446
+381,535,-558
+-702,-488,-531
+560,610,790
+-848,614,-306
+505,548,698
+-907,478,-375
+536,492,879
+-483,757,852
+-533,901,844
+-807,592,-441
+-477,-539,567
+414,-641,417
+-625,873,822
+-593,-578,691
+464,-627,539
+-28,-46,-73
+340,670,-454
+263,-610,-692
+520,-680,479
+-466,-669,669
+-712,-542,-439
+
+--- scanner 21 ---
+-266,486,648
+578,-611,-708
+-818,735,-464
+-759,-456,-789
+-691,-545,727
+407,-548,624
+-407,414,606
+496,-666,600
+-706,-562,774
+-278,471,630
+634,761,-544
+747,571,696
+-676,657,-492
+-698,-556,767
+63,-153,67
+807,624,640
+525,774,-558
+626,-676,-624
+624,-631,-871
+-627,-432,-708
+550,778,-542
+-734,-461,-727
+-742,786,-431
+869,585,746
+588,-604,655
+
+--- scanner 22 ---
+-658,443,-873
+688,-773,-852
+94,86,-43
+365,435,679
+316,-602,678
+-101,19,38
+-343,-416,-420
+-561,407,-825
+-462,383,561
+-405,-615,824
+-359,-493,-424
+-404,-525,719
+-443,-536,772
+636,-689,-733
+749,-675,-833
+372,-687,552
+325,374,707
+387,-740,687
+-564,-448,-433
+623,594,-764
+-348,402,662
+531,670,-784
+629,524,-772
+427,309,767
+65,-103,67
+-684,443,-722
+-366,362,619
+
+--- scanner 23 ---
+435,-295,689
+376,-489,-751
+-776,528,-600
+756,497,-606
+-659,601,725
+-827,580,630
+342,-579,-639
+426,-366,551
+-413,-413,-550
+-506,-524,-604
+394,425,766
+-833,-691,657
+-684,592,547
+341,464,755
+-794,-638,537
+785,355,-582
+-750,639,-687
+561,-351,604
+-144,111,172
+-458,-337,-549
+289,426,676
+25,-25,67
+438,-669,-710
+-742,669,-641
+-708,-718,603
+757,492,-651
+
+--- scanner 24 ---
+-111,-95,111
+361,-657,765
+-582,632,729
+505,-558,752
+-589,-581,768
+-530,716,848
+-893,-431,-711
+748,709,611
+-831,683,-691
+657,337,-287
+-853,-492,-683
+-791,-366,-771
+740,-662,-280
+63,-50,-45
+-846,630,-556
+382,-527,879
+737,-458,-369
+819,-451,-281
+656,803,580
+701,756,570
+567,372,-315
+645,506,-298
+-595,-651,760
+-469,618,829
+-902,545,-682
+-687,-727,780
+
+--- scanner 25 ---
+538,-604,597
+-69,170,-40
+486,-485,641
+424,-543,644
+-475,-696,544
+455,-396,-443
+-800,563,438
+-448,-571,490
+498,456,-351
+688,967,784
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+
+--- scanner 26 ---
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+
+--- scanner 27 ---
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+
+--- scanner 28 ---
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+
+--- scanner 29 ---
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diff --git a/aoc2021/input/test19.in b/aoc2021/input/test19.in
new file mode 100644
index 0000000..4e496e9
--- /dev/null
+++ b/aoc2021/input/test19.in
@@ -0,0 +1,136 @@
+--- scanner 0 ---
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+
+--- scanner 1 ---
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+
+--- scanner 2 ---
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+
+--- scanner 3 ---
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+
+--- scanner 4 ---
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