diff --git a/2021/05/README.md b/2021/05/README.md
new file mode 100644
index 0000000..6078701
--- /dev/null
+++ b/2021/05/README.md
@@ -0,0 +1,11 @@
+# 05
+
+Description
+
+<details>
+  <summary>Solutions</summary>
+  <ol>
+    <li>5608</li>
+    <li>20299</li>
+  </ol>
+</details>
diff --git a/2021/05/input.txt b/2021/05/input.txt
new file mode 100644
index 0000000..bd0db27
--- /dev/null
+++ b/2021/05/input.txt
@@ -0,0 +1,501 @@
+973,543 -> 601,915
+758,846 -> 758,168
+511,976 -> 568,976
+858,536 -> 858,677
+256,238 -> 265,238
+475,919 -> 718,919
+973,912 -> 134,73
+984,159 -> 175,968
+166,641 -> 15,490
+504,798 -> 504,946
+717,796 -> 128,207
+302,713 -> 168,713
+830,964 -> 830,444
+151,288 -> 549,686
+530,908 -> 820,908
+540,394 -> 717,394
+581,614 -> 581,496
+111,593 -> 230,712
+938,884 -> 938,917
+923,71 -> 20,974
+530,677 -> 530,332
+144,723 -> 144,980
+700,376 -> 700,917
+501,95 -> 198,95
+251,900 -> 435,900
+912,931 -> 96,115
+962,140 -> 181,921
+104,244 -> 104,178
+504,865 -> 504,612
+301,284 -> 301,173
+973,980 -> 17,24
+886,166 -> 886,455
+380,150 -> 971,741
+57,405 -> 135,405
+515,569 -> 774,310
+227,233 -> 874,880
+75,33 -> 75,290
+487,434 -> 983,930
+17,279 -> 20,279
+719,838 -> 508,627
+262,254 -> 555,254
+516,626 -> 631,511
+352,305 -> 352,715
+876,827 -> 876,731
+372,85 -> 372,344
+619,773 -> 619,799
+885,627 -> 441,627
+779,731 -> 42,731
+806,756 -> 806,237
+378,540 -> 187,540
+840,296 -> 210,296
+250,234 -> 171,234
+249,100 -> 757,608
+787,23 -> 787,826
+690,175 -> 365,175
+238,166 -> 238,738
+52,350 -> 574,872
+297,518 -> 297,590
+133,263 -> 133,219
+438,955 -> 939,955
+621,500 -> 621,948
+93,39 -> 530,476
+988,866 -> 220,98
+483,30 -> 329,184
+205,937 -> 419,723
+314,910 -> 842,910
+472,944 -> 923,944
+487,700 -> 586,601
+59,17 -> 333,17
+553,307 -> 553,746
+810,37 -> 810,167
+898,662 -> 858,662
+191,837 -> 191,157
+83,950 -> 83,910
+229,513 -> 559,843
+825,192 -> 44,973
+37,80 -> 460,503
+648,357 -> 29,357
+603,592 -> 425,770
+137,141 -> 693,141
+179,69 -> 479,69
+851,164 -> 172,164
+916,143 -> 99,960
+908,20 -> 28,900
+178,404 -> 700,404
+122,43 -> 645,43
+548,495 -> 155,888
+216,725 -> 216,583
+790,97 -> 51,836
+98,214 -> 98,200
+90,464 -> 141,464
+32,905 -> 912,25
+253,743 -> 253,115
+521,826 -> 304,826
+733,392 -> 733,485
+315,95 -> 964,744
+386,749 -> 553,916
+698,985 -> 59,346
+380,969 -> 820,969
+134,641 -> 310,641
+66,899 -> 860,105
+827,304 -> 560,37
+824,213 -> 132,905
+93,138 -> 200,245
+54,450 -> 54,436
+163,276 -> 31,408
+959,333 -> 976,333
+499,129 -> 645,129
+924,321 -> 924,332
+629,166 -> 629,901
+505,769 -> 864,410
+80,360 -> 48,360
+22,971 -> 983,10
+500,87 -> 721,87
+227,737 -> 227,540
+698,177 -> 698,713
+20,106 -> 20,204
+187,176 -> 902,891
+803,806 -> 574,806
+413,785 -> 413,858
+736,728 -> 28,728
+158,870 -> 20,870
+78,475 -> 75,472
+481,434 -> 80,434
+975,208 -> 425,208
+59,639 -> 304,639
+287,919 -> 923,283
+940,933 -> 104,97
+699,429 -> 466,429
+240,988 -> 929,299
+970,873 -> 396,873
+441,585 -> 441,697
+337,259 -> 36,259
+45,759 -> 45,382
+220,468 -> 373,315
+10,262 -> 793,262
+753,268 -> 147,874
+664,560 -> 603,560
+974,81 -> 974,26
+575,331 -> 254,331
+754,378 -> 727,378
+354,394 -> 298,450
+108,814 -> 108,804
+848,375 -> 604,375
+697,530 -> 697,288
+977,54 -> 967,44
+241,754 -> 484,754
+793,745 -> 755,745
+974,415 -> 974,98
+677,367 -> 677,731
+69,744 -> 695,118
+50,39 -> 940,929
+414,721 -> 414,917
+870,587 -> 870,396
+881,759 -> 583,759
+679,798 -> 679,226
+826,917 -> 217,917
+896,919 -> 102,919
+528,881 -> 498,881
+15,89 -> 15,212
+887,280 -> 747,280
+763,303 -> 967,507
+904,964 -> 562,964
+157,752 -> 433,752
+752,199 -> 34,917
+60,970 -> 921,109
+934,434 -> 683,183
+748,427 -> 748,601
+20,47 -> 957,984
+71,691 -> 332,691
+782,637 -> 782,137
+483,623 -> 704,623
+11,965 -> 274,965
+285,172 -> 700,172
+613,845 -> 855,845
+955,296 -> 738,296
+596,750 -> 596,974
+332,851 -> 360,851
+176,388 -> 107,388
+116,328 -> 325,119
+932,588 -> 403,588
+247,420 -> 247,69
+52,965 -> 52,740
+541,579 -> 541,48
+321,530 -> 321,115
+124,33 -> 986,895
+575,950 -> 922,603
+231,814 -> 755,814
+940,445 -> 957,462
+365,743 -> 432,810
+488,286 -> 777,286
+988,905 -> 887,905
+715,846 -> 842,846
+481,894 -> 481,954
+297,868 -> 297,441
+368,928 -> 368,348
+951,981 -> 49,79
+46,743 -> 551,743
+900,241 -> 50,241
+441,942 -> 441,762
+488,58 -> 488,482
+945,187 -> 945,639
+263,779 -> 476,779
+593,290 -> 593,985
+781,498 -> 914,498
+351,557 -> 351,324
+809,966 -> 709,966
+912,545 -> 522,155
+985,681 -> 903,599
+837,881 -> 532,881
+728,485 -> 753,460
+79,680 -> 79,448
+917,769 -> 917,456
+135,845 -> 135,777
+460,922 -> 981,401
+516,830 -> 516,403
+230,419 -> 230,267
+770,297 -> 583,297
+577,782 -> 488,693
+118,728 -> 791,55
+983,192 -> 983,340
+307,252 -> 393,338
+83,345 -> 83,628
+318,461 -> 318,670
+809,385 -> 809,383
+145,124 -> 444,124
+906,892 -> 906,990
+295,22 -> 295,617
+828,312 -> 828,227
+546,132 -> 546,100
+398,750 -> 398,237
+27,770 -> 299,770
+863,517 -> 863,869
+700,806 -> 168,806
+279,262 -> 169,152
+954,285 -> 681,12
+896,102 -> 127,871
+527,532 -> 404,532
+853,397 -> 168,397
+642,273 -> 595,273
+422,123 -> 422,805
+879,789 -> 879,177
+233,171 -> 917,855
+82,148 -> 559,148
+95,969 -> 95,65
+876,779 -> 876,257
+753,35 -> 51,737
+421,756 -> 735,756
+637,602 -> 637,886
+275,689 -> 275,360
+714,77 -> 714,353
+617,645 -> 764,645
+131,702 -> 689,702
+752,795 -> 524,567
+606,716 -> 632,716
+261,700 -> 261,104
+196,894 -> 377,713
+812,626 -> 812,76
+739,368 -> 360,747
+976,646 -> 976,981
+459,948 -> 500,948
+154,669 -> 179,644
+410,896 -> 661,645
+312,187 -> 248,123
+507,655 -> 513,655
+649,726 -> 649,447
+874,19 -> 24,19
+951,64 -> 57,958
+29,60 -> 533,60
+559,262 -> 941,644
+665,319 -> 531,185
+835,601 -> 918,601
+269,556 -> 871,556
+410,708 -> 410,163
+271,105 -> 860,105
+143,427 -> 475,95
+716,656 -> 716,270
+111,771 -> 822,60
+170,775 -> 233,775
+730,588 -> 730,106
+592,161 -> 901,470
+486,802 -> 289,802
+113,770 -> 726,157
+127,98 -> 825,796
+392,957 -> 794,957
+529,793 -> 529,117
+347,196 -> 347,310
+893,613 -> 360,80
+961,362 -> 961,399
+577,52 -> 577,566
+792,578 -> 792,622
+35,883 -> 35,395
+499,779 -> 499,752
+921,359 -> 921,90
+557,224 -> 290,224
+863,190 -> 874,190
+100,190 -> 100,519
+909,38 -> 33,914
+44,421 -> 98,421
+731,787 -> 731,462
+722,28 -> 722,685
+913,538 -> 274,538
+149,648 -> 149,186
+302,594 -> 521,594
+927,333 -> 546,714
+503,42 -> 333,42
+474,260 -> 835,621
+825,363 -> 825,188
+335,140 -> 227,32
+914,613 -> 914,15
+955,734 -> 398,734
+506,913 -> 506,232
+612,271 -> 612,881
+155,856 -> 282,856
+207,820 -> 898,129
+329,463 -> 475,463
+371,719 -> 371,737
+103,503 -> 103,722
+846,779 -> 360,293
+597,247 -> 253,247
+305,912 -> 305,960
+283,277 -> 283,358
+369,327 -> 418,327
+107,190 -> 107,269
+469,247 -> 918,247
+944,213 -> 990,213
+930,158 -> 594,158
+459,844 -> 459,519
+493,387 -> 107,387
+514,173 -> 669,328
+818,876 -> 73,131
+405,783 -> 405,54
+583,151 -> 583,654
+211,462 -> 211,938
+639,224 -> 639,728
+561,33 -> 561,719
+607,244 -> 47,244
+772,61 -> 772,795
+777,920 -> 63,206
+121,281 -> 90,281
+668,99 -> 893,99
+352,620 -> 652,620
+589,50 -> 547,50
+845,252 -> 845,974
+666,870 -> 94,870
+724,524 -> 344,904
+569,40 -> 482,40
+224,619 -> 741,619
+935,110 -> 143,902
+107,37 -> 906,836
+308,298 -> 821,298
+983,619 -> 868,734
+659,166 -> 497,328
+60,423 -> 60,507
+483,283 -> 90,283
+568,309 -> 568,873
+262,461 -> 890,461
+328,633 -> 94,867
+892,195 -> 177,910
+310,874 -> 915,269
+647,54 -> 531,54
+749,523 -> 408,864
+597,882 -> 857,882
+756,498 -> 468,498
+671,248 -> 671,510
+676,855 -> 130,309
+46,18 -> 659,18
+144,164 -> 87,221
+412,774 -> 412,930
+67,368 -> 745,368
+246,704 -> 619,331
+714,113 -> 159,113
+203,109 -> 203,641
+418,708 -> 110,708
+619,546 -> 619,531
+617,957 -> 545,957
+630,423 -> 630,909
+584,379 -> 679,474
+572,918 -> 572,16
+101,712 -> 755,58
+167,317 -> 912,317
+836,130 -> 570,130
+759,847 -> 523,847
+901,40 -> 901,479
+908,157 -> 908,558
+351,252 -> 280,181
+648,730 -> 253,730
+330,984 -> 110,984
+717,552 -> 746,581
+206,831 -> 904,133
+684,232 -> 684,20
+889,73 -> 155,73
+896,728 -> 896,589
+55,983 -> 988,50
+342,746 -> 342,617
+138,683 -> 795,26
+968,226 -> 787,226
+311,713 -> 355,713
+201,789 -> 201,401
+909,623 -> 205,623
+540,130 -> 540,722
+695,511 -> 191,511
+221,320 -> 221,68
+75,118 -> 599,642
+982,977 -> 30,25
+534,598 -> 720,784
+355,579 -> 13,921
+137,516 -> 137,665
+510,244 -> 510,392
+845,52 -> 327,570
+167,100 -> 909,100
+573,133 -> 34,672
+371,341 -> 371,823
+959,981 -> 20,42
+143,793 -> 143,134
+815,798 -> 914,897
+286,212 -> 188,114
+28,987 -> 985,30
+652,108 -> 652,540
+978,565 -> 507,94
+817,166 -> 402,166
+250,723 -> 128,845
+676,274 -> 53,897
+981,985 -> 12,16
+682,195 -> 270,195
+409,113 -> 114,113
+585,83 -> 585,514
+897,978 -> 569,650
+158,420 -> 158,709
+603,335 -> 966,698
+484,53 -> 972,541
+149,128 -> 149,329
+555,926 -> 555,393
+143,849 -> 614,378
+816,79 -> 507,79
+525,502 -> 812,502
+736,509 -> 736,579
+612,179 -> 629,179
+821,70 -> 821,566
+665,90 -> 416,90
+63,80 -> 837,854
+151,873 -> 890,134
+698,204 -> 698,973
+936,693 -> 612,369
+369,628 -> 947,50
+308,407 -> 308,590
+367,156 -> 963,752
+949,943 -> 536,530
+589,553 -> 256,886
+348,171 -> 348,759
+546,488 -> 546,585
+351,486 -> 779,58
+952,45 -> 33,964
+187,896 -> 187,100
+725,679 -> 725,486
+756,147 -> 264,639
+281,205 -> 281,764
+630,221 -> 73,221
+919,953 -> 775,953
+552,821 -> 925,821
+294,854 -> 922,226
+772,642 -> 961,831
+705,159 -> 308,556
+107,983 -> 393,697
+403,277 -> 403,802
+719,824 -> 719,187
+947,956 -> 253,956
+453,135 -> 952,135
+905,491 -> 574,160
+498,225 -> 764,491
+741,111 -> 597,111
+881,130 -> 881,668
+308,616 -> 866,616
+172,434 -> 855,434
+218,412 -> 218,861
+293,318 -> 293,770
+712,513 -> 679,513
+100,586 -> 434,920
+338,407 -> 176,407
+481,534 -> 715,768
+805,127 -> 216,127
+406,425 -> 322,425
+154,769 -> 823,100
+813,508 -> 159,508
+286,637 -> 286,24
+55,836 -> 665,836
+571,857 -> 459,969
+414,977 -> 414,604
+133,884 -> 972,45
+383,522 -> 383,141
+889,14 -> 62,841
+122,49 -> 43,49
+544,846 -> 544,76
+948,19 -> 62,905
+798,577 -> 833,542
+973,267 -> 751,45
+620,648 -> 620,419
+102,813 -> 633,813
+255,263 -> 826,263
+231,394 -> 231,811
+
diff --git a/2021/05/python/main.py b/2021/05/python/main.py
new file mode 100644
index 0000000..093ea54
--- /dev/null
+++ b/2021/05/python/main.py
@@ -0,0 +1,141 @@
+#!/usr/bin/env python
+
+from os.path import join, dirname
+from typing import List
+
+# Day 05
+
+# Common
+
+
+def read_input(filename):
+    data = join(dirname(__file__), '..', filename)
+    with open(data) as f:
+        return f.read().strip()
+
+
+class Point:
+    def __init__(self, x, y):
+        self.x = x
+        self.y = y
+
+    def __repr__(self) -> str:
+        return f'({self.x},{self.y})'
+
+    @staticmethod
+    def parse(raw: str):
+        x, y = raw.strip().split(',')
+        return Point(int(x), int(y))
+
+
+class Line:
+    def __init__(self, a: Point, b: Point):
+        self.a = a
+        self.b = b
+
+    def is_straight(self) -> bool:
+        return self.a.x == self.b.x or self.a.y == self.b.y
+
+    def is_diagonal(self) -> bool:
+        return abs(self.a.x - self.b.x) == abs(self.a.y - self.b.y)
+
+    def get_points(self) -> List[Point]:
+        if self.is_straight():
+            if self.a.x == self.b.x:
+                return [
+                    Point(self.a.x, y) for y
+                    in range(min(self.a.y, self.b.y), max(self.a.y, self.b.y) + 1)
+                ]
+            else:
+                return [
+                    Point(x, self.a.y) for x
+                    in range(min(self.a.x, self.b.x), max(self.a.x, self.b.x) + 1)
+                ]
+        else:
+            dx = self.a.x - self.b.x
+            dy = self.a.y - self.b.y
+            sign_x = 1 if dx < 0 else -1
+            sign_y = 1 if dy < 0 else -1
+            return [
+                Point(self.a.x + sign_x * i, self.a.y + sign_y * i)
+                for i in range(abs(dx) + 1)
+            ]
+
+    def __repr__(self) -> str:
+        return f'{self.a} → {self.b}'
+
+    @staticmethod
+    def parse(raw: str):
+        a, b = raw.strip().split('->')
+        return Line(Point.parse(a), Point.parse(b))
+
+
+class Scan:
+    def __init__(self, lines: List[Line]):
+        self.lines = lines
+
+    def keep_straight(self):
+        self.lines = [line for line in self.lines if line.is_straight()]
+
+    def keep_straight_and_diagonal(self):
+        self.lines = [
+            line for line in self.lines
+            if line.is_straight() or line.is_diagonal()
+        ]
+
+    def matrix(self) -> List[List[int]]:
+        x_max = max(max(line.a.x, line.b.x) for line in self.lines)
+        y_max = max(max(line.a.y, line.b.y) for line in self.lines)
+        matrix = [
+            [0 for _ in range(x_max + 1)]
+            for _ in range(y_max + 1)
+        ]
+        for line in self.lines:
+            for point in line.get_points():
+                matrix[point.y][point.x] += 1
+        return matrix
+
+    def plot(self) -> str:
+        output = '\n'.join([
+            ' '.join(str(x) for x in row)
+            for row in self.matrix()
+        ])
+        return output.replace('0', '.')
+
+    def danger(self) -> int:
+        matrix = self.matrix()
+        return sum(
+            sum(1 for x in row if x > 1)
+            for row in matrix
+        )
+
+    @ staticmethod
+    def parse(raw: str):
+        return Scan([Line.parse(line) for line in raw.strip().split('\n')])
+
+
+test = read_input('test.txt')
+data = read_input('input.txt')
+
+# 1
+print('1.')
+scan = Scan.parse(test)
+scan.keep_straight()
+print(scan.plot())
+print('Test: ', scan.danger())
+
+scan = Scan.parse(data)
+scan.keep_straight()
+print('Real: ', scan.danger())
+
+# 2
+print('\n2.')
+
+scan = Scan.parse(test)
+scan.keep_straight_and_diagonal()
+print(scan.plot())
+print('Test: ', scan.danger())
+
+scan = Scan.parse(data)
+scan.keep_straight_and_diagonal()
+print('Real: ', scan.danger())
diff --git a/2021/05/test.txt b/2021/05/test.txt
new file mode 100644
index 0000000..b258f68
--- /dev/null
+++ b/2021/05/test.txt
@@ -0,0 +1,10 @@
+0,9 -> 5,9
+8,0 -> 0,8
+9,4 -> 3,4
+2,2 -> 2,1
+7,0 -> 7,4
+6,4 -> 2,0
+0,9 -> 2,9
+3,4 -> 1,4
+0,0 -> 8,8
+5,5 -> 8,2