diff --git a/days/20.go b/days/20.go
new file mode 100644
index 0000000..3fd2aa9
--- /dev/null
+++ b/days/20.go
@@ -0,0 +1,398 @@
+package days
+
+import (
+	"container/heap"
+	"fmt"
+	"math"
+	"strings"
+
+	u "parnic.com/aoc2019/utilities"
+)
+
+type day20Cell int8
+type day20Graph map[day20Portal][]u.Pair[day20Portal, int]
+
+const (
+	day20CellWall day20Cell = iota
+	day20CellPath
+	day20CellDonutHole
+)
+
+var (
+	day20AdjacentOffsets = []u.Vec2i{
+		{X: -1, Y: 0},
+		{X: 1, Y: 0},
+		{X: 0, Y: -1},
+		{X: 0, Y: 1},
+	}
+
+	entrancePortal = day20Portal{name: "AA"}
+	exitPortal     = day20Portal{name: "ZZ"}
+)
+
+type day20Portal struct {
+	name  string
+	inner bool
+	depth int
+}
+
+type Day20 struct {
+	grid        [][]day20Cell
+	entrance    u.Vec2i
+	exit        u.Vec2i
+	portals     map[day20Portal]u.Vec2i
+	portalNames []string
+}
+
+func (d *Day20) Parse() {
+	d.portals = make(map[day20Portal]u.Vec2i)
+	d.portalNames = make([]string, 0)
+
+	lines := u.GetStringLines("20p")
+	d.grid = make([][]day20Cell, len(lines)-4)
+	currPortal := strings.Builder{}
+
+	for row, line := range lines {
+		y := row - 2
+		isGridRow := row >= 2 && row < len(lines)-2
+
+		if isGridRow {
+			d.grid[y] = make([]day20Cell, len(line)-4)
+		}
+
+		for col, ch := range lines[row] {
+			x := col - 2
+			isGridCol := col >= 2 && col < len(line)-2
+
+			if isGridRow && isGridCol {
+				if ch == '#' {
+					d.grid[y][x] = day20CellWall
+				} else if ch == '.' {
+					d.grid[y][x] = day20CellPath
+				} else {
+					d.grid[y][x] = day20CellDonutHole
+				}
+			}
+
+			if ch >= 'A' && ch <= 'Z' {
+				portalX := 0
+				portalY := 0
+				if len(line) > col+1 && line[col+1] >= 'A' && line[col+1] <= 'Z' {
+					currPortal.WriteRune(ch)
+					currPortal.WriteRune(rune(line[col+1]))
+
+					if len(line) > col+2 && line[col+2] == '.' {
+						portalY = y
+						portalX = x + 2
+					} else if col-1 >= 0 && line[col-1] == '.' {
+						portalY = y
+						portalX = x - 1
+					} else {
+						panic("!")
+					}
+				} else if len(lines) > row+1 && lines[row+1][col] >= 'A' && lines[row+1][col] <= 'Z' {
+					currPortal.WriteRune(ch)
+					currPortal.WriteRune(rune(lines[row+1][col]))
+
+					if len(lines) > row+2 && lines[row+2][col] == '.' {
+						portalY = y + 2
+						portalX = x
+					} else if row-1 >= 0 && lines[row-1][col] == '.' {
+						portalY = y - 1
+						portalX = x
+					} else {
+						panic("!")
+					}
+				}
+
+				if currPortal.Len() == 2 {
+					portalName := currPortal.String()
+					portalVec := u.Vec2i{X: portalX, Y: portalY}
+
+					if portalName == entrancePortal.name {
+						d.entrance = portalVec
+					} else if portalName == exitPortal.name {
+						d.exit = portalVec
+					} else {
+						portal := day20Portal{
+							name:  portalName,
+							inner: !d.isOuterPortal(portalVec),
+						}
+						d.portals[portal] = portalVec
+
+						u.AddToArray(&d.portalNames, portalName)
+					}
+
+					currPortal.Reset()
+				}
+			}
+		}
+	}
+}
+
+func (d Day20) Num() int {
+	return 20
+}
+
+func (d Day20) isPortal(vec u.Vec2i) (bool, int) {
+	if d.grid[vec.Y][vec.X] != day20CellPath {
+		return false, 0
+	}
+
+	for i, name := range d.portalNames {
+		p, exists := d.portals[day20Portal{name: name, inner: !d.isOuterPortal(vec)}]
+		if exists && vec == p {
+			return true, i
+		}
+	}
+
+	return false, 0
+}
+
+func (d Day20) Draw() {
+	for y := range d.grid {
+		for x := range d.grid[y] {
+			switch d.grid[y][x] {
+			case day20CellWall:
+				fmt.Print("█")
+			case day20CellDonutHole:
+				fmt.Print(" ")
+			case day20CellPath:
+				posVec := u.Vec2i{X: x, Y: y}
+				if posVec == d.entrance {
+					fmt.Print("@")
+				} else if posVec == d.exit {
+					fmt.Print("!")
+				} else {
+					isPortal, portalIdx := d.isPortal(posVec)
+					if isPortal {
+						ch := 'a' + portalIdx
+						if ch > 'z' {
+							ch = 'A' + (portalIdx - 26)
+						}
+						fmt.Printf("%c", ch)
+					} else {
+						fmt.Print(" ")
+					}
+				}
+			}
+		}
+
+		fmt.Println()
+	}
+}
+
+func (d Day20) isOuterPortal(pos u.Vec2i) bool {
+	return pos.X == 0 || pos.Y == 0 || pos.X == len(d.grid[0])-1 || pos.Y == len(d.grid)-1
+}
+
+func (d Day20) findAdjacentCells(inPos u.Vec2i) []u.Pair[day20Portal, int] {
+	found := make([]u.Pair[day20Portal, int], 0)
+
+	getAdjacent := func(pos u.Vec2i) []u.Vec2i {
+		retAdjacent := make([]u.Vec2i, 0, len(day20AdjacentOffsets))
+		for _, off := range day20AdjacentOffsets {
+			offVec := u.Vec2i{X: pos.X + off.X, Y: pos.Y + off.Y}
+			if offVec.Y < 0 || offVec.Y >= len(d.grid) || offVec.X < 0 || offVec.X >= len(d.grid[0]) {
+				continue
+			}
+			if d.grid[offVec.Y][offVec.X] != day20CellPath {
+				continue
+			}
+			retAdjacent = append(retAdjacent, offVec)
+		}
+
+		return retAdjacent
+	}
+
+	queue := make([]u.Pair[int, u.Vec2i], 0)
+	visited := map[u.Vec2i]bool{
+		inPos: true,
+	}
+	for _, adjacent := range getAdjacent(inPos) {
+		queue = append(queue, u.Pair[int, u.Vec2i]{First: 1, Second: adjacent})
+	}
+
+	for len(queue) > 0 {
+		next := queue[0]
+		queue = queue[1:]
+
+		if _, exists := visited[next.Second]; !exists {
+			visited[next.Second] = true
+
+			adjacentIsPortal, portalIdx := d.isPortal(next.Second)
+			if adjacentIsPortal || next.Second == d.entrance || next.Second == d.exit {
+				var portalName string
+				if next.Second == d.entrance {
+					portalName = entrancePortal.name
+				} else if next.Second == d.exit {
+					portalName = exitPortal.name
+				} else {
+					portalName = d.portalNames[portalIdx]
+				}
+
+				alreadyFound := false
+				for _, p := range found {
+					if p.First.name == portalName {
+						alreadyFound = true
+						break
+					}
+				}
+				if !alreadyFound {
+					found = append(found, u.Pair[day20Portal, int]{First: day20Portal{
+						name:  portalName,
+						inner: !d.isOuterPortal(next.Second),
+					}, Second: next.First})
+					continue
+				}
+			}
+
+			for _, neighbor := range getAdjacent(next.Second) {
+				if _, exists := visited[neighbor]; !exists {
+					queue = append(queue, u.Pair[int, u.Vec2i]{First: next.First + 1, Second: neighbor})
+				}
+			}
+		}
+	}
+
+	return found
+}
+
+type day20PriorityQueue struct {
+	distance int
+	neighbor day20Portal
+}
+type day20PriorityQueueHeap []day20PriorityQueue
+
+func (h day20PriorityQueueHeap) Len() int           { return len(h) }
+func (h day20PriorityQueueHeap) Less(i, j int) bool { return h[i].distance < h[j].distance }
+func (h day20PriorityQueueHeap) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }
+
+func (h *day20PriorityQueueHeap) Push(x any) {
+	*h = append(*h, x.(day20PriorityQueue))
+}
+
+func (h *day20PriorityQueueHeap) Pop() any {
+	old := *h
+	n := len(old)
+	x := old[n-1]
+	*h = old[0 : n-1]
+	return x
+}
+
+func (d Day20) dijkstra(graph day20Graph, start, end day20Portal, neighborFunc func(inPortal day20Portal) []u.Pair[day20Portal, int]) int {
+	distance := make(map[day20Portal]int)
+
+	ih := day20PriorityQueueHeap{
+		day20PriorityQueue{
+			distance: 0,
+			neighbor: start,
+		},
+	}
+
+	heap.Init(&ih)
+	visited := make(map[day20Portal]bool)
+
+	for ih.Len() > 0 {
+		node := heap.Pop(&ih).(day20PriorityQueue)
+
+		if node.neighbor == end {
+			return node.distance
+		}
+
+		if _, exists := visited[node.neighbor]; exists {
+			continue
+		}
+
+		visited[node.neighbor] = true
+
+		for _, p := range neighborFunc(node.neighbor) {
+			if _, exists := visited[p.First]; exists {
+				continue
+			}
+
+			newDistance := node.distance + p.Second
+			if dist, exists := distance[p.First]; !exists || newDistance < dist {
+				distance[p.First] = newDistance
+				heap.Push(&ih, day20PriorityQueue{
+					distance: newDistance,
+					neighbor: p.First,
+				})
+			}
+		}
+	}
+
+	return math.MaxInt
+}
+
+func (d Day20) buildGraph() day20Graph {
+	graph := make(day20Graph, len(d.portals)+1)
+
+	adjacent := d.findAdjacentCells(d.entrance)
+	graph[entrancePortal] = adjacent
+
+	for portal, portalVec := range d.portals {
+		adjacent = d.findAdjacentCells(portalVec)
+		graph[portal] = adjacent
+	}
+
+	return graph
+}
+
+func (d Day20) getDepthNeighbors(graph day20Graph, portal day20Portal) []u.Pair[day20Portal, int] {
+	basePortal := portal
+	basePortal.depth = 0
+	baseNeighbors := graph[basePortal]
+
+	neighbors := make([]u.Pair[day20Portal, int], 0)
+
+	if portal.inner {
+		n := day20Portal{name: portal.name, inner: false, depth: portal.depth + 1}
+		neighbors = append(neighbors, u.Pair[day20Portal, int]{First: n, Second: 1})
+	}
+
+	if portal.depth == 0 {
+		for _, i := range baseNeighbors {
+			if i.First.inner || i.First.name == entrancePortal.name || i.First.name == exitPortal.name {
+				neighbors = append(neighbors, u.Pair[day20Portal, int]{First: i.First, Second: i.Second})
+			}
+		}
+	} else {
+		if !portal.inner {
+			n := day20Portal{name: portal.name, inner: true, depth: portal.depth - 1}
+			neighbors = append(neighbors, u.Pair[day20Portal, int]{First: n, Second: 1})
+		}
+
+		for _, i := range baseNeighbors {
+			if i.First.name != entrancePortal.name && i.First.name != exitPortal.name {
+				n := day20Portal{name: i.First.name, inner: i.First.inner, depth: portal.depth}
+				neighbors = append(neighbors, u.Pair[day20Portal, int]{First: n, Second: i.Second})
+			}
+		}
+	}
+
+	return neighbors
+}
+
+func (d *Day20) Part1() string {
+	// d.Draw()
+
+	graph := d.buildGraph()
+
+	for portal, adjacent := range graph {
+		if portal.name == entrancePortal.name {
+			continue
+		}
+
+		graph[portal] = append(adjacent, u.Pair[day20Portal, int]{First: day20Portal{name: portal.name, inner: !portal.inner}, Second: 1})
+	}
+
+	distance := d.dijkstra(graph, entrancePortal, exitPortal, func(inPortal day20Portal) []u.Pair[day20Portal, int] { return graph[inPortal] })
+	return fmt.Sprintf("Steps to traverse maze: %s%d%s", u.TextBold, distance, u.TextReset)
+}
+
+func (d *Day20) Part2() string {
+	graph := d.buildGraph()
+	distance := d.dijkstra(graph, entrancePortal, exitPortal, func(inPortal day20Portal) []u.Pair[day20Portal, int] { return d.getDepthNeighbors(graph, inPortal) })
+	return fmt.Sprintf("Steps to traverse recursive maze: %s%d%s", u.TextBold, distance, u.TextReset)
+}
diff --git a/inputs/20p.txt b/inputs/20p.txt
new file mode 100644
index 0000000..a1d4d0c
--- /dev/null
+++ b/inputs/20p.txt
@@ -0,0 +1,113 @@
+                                   G           R   U       E         Z S       S                                       
+                                   W           N   C       K         Z G       D                                       
+  #################################.###########.###.#######.#########.#.#######.#####################################  
+  #.#.......#.#.........#.#.#.....#.#.....#.#.#...#.....#.........#.....#...#.#...........#.......#.....#.....#.#...#  
+  #.#####.###.###.###.#.#.#.###.###.#.###.#.#.###.#.###.###.#####.#.###.###.#.###.#########.###.###.#######.###.#.###  
+  #.#.#.#...#...#.#.#.#.................#.#...#...#.#.#...#.#.....#.#.#.#.....................#.#.......#.........#.#  
+  #.#.#.#.###.#####.#########.###########.#.#.#.###.#.#######.###.#.#.#####.###.#.###.#.###.#.###.#######.#######.#.#  
+  #...#...#.#.#.#.........#...#...#.......#.#...#.......#.....#.#.#.....#.....#.#...#.#.#...#.#...#.#.........#.#.#.#  
+  #.#.###.#.#.#.#####.#.#.#######.#.#######.###.#.###.#####.###.#####.#.###.#########.#.#.#######.#.#####.#####.#.#.#  
+  #.#...#.#.#.#.#.....#.#.................#.#...#.#.#.....#...#.#.#...#...#.#.....#.#.#.#...#.#.#...........#.#.....#  
+  ###.###.#.#.#.#.#.#####.#.###.#########.#.#######.#.#####.###.#.#.#.#####.#.#.###.#.#######.#.#.###.#######.###.#.#  
+  #...#.......#...#.#.#.#.#...#.#.........#.....#.......#.#.......#.#...#.....#.....#.#...#.........#...#.#.#.#.#.#.#  
+  ###.#######.#######.#.###########.#.#####.###.#####.###.#.#####.#.###.#.#.###.#.#######.###.#####.#####.#.#.#.#####  
+  #.......#.#...#.......#.........#.#.#...#.#.#.#.....#.....#...#.#...#.#.#.#...#...#...#...#...#.#.#...........#.#.#  
+  #.#.###.#.#.#########.#########.#.###.###.#.#####.#.###.#.#.#.#.#.###########.#.###.###.###.###.###.###.#.#####.#.#  
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+  #.#.#.#.#...#.#...#...#.#.#...#...#...#.#.#.....#.#...#.#.#.....#.#...#.#.#.......#.......#...#.#.....#.........#.#  
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+  #.....#.......#...#...#...#.#.#.#.#.#.#.#.......#.#...#.#.#.#...#.......#...#.......#...#.....#...#.#.........#...#  
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+  #.###.#.#.#####.#.###.#.###.#    D             M       E     H     X       Q          #.#.#.#####.#.###.#####.#.###  
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+  #.#.#.....#.#...#.#.#.#.....#                                                       RZ..#.#...#.....#.#...#.#.#.#..BE
+  #.#.#####.#.#####.#.#####.###                                                         #######.#####.#.#.#######.#.#  
+  #.....#.#.....#.#.#.....#.#.#                                                         #.#.#.#.#.#...#.......#...#.#  
+  ###.###.###.#.#.#.#.###.#.#.#                                                         #.#.#.###.#####.#.#######.#.#  
+RI....#.....#.#.#...#.#.#.#....UW                                                       #.#.......#...#.#.#.#...#...#  
+  #####.###############.###.###                                                         #.###.#####.#.#####.#.#.#####  
+  #.....#.#.#...#.#.....#.#...#                                                       GW..........#.#.........#.#...#  
+  #.###.#.#.#.###.###.###.#####                                                         #.###.#.#.###.#######.###.###  
+  #...#...#.....#.#.......#....FM                                                       #.#...#.#.....#...#.........#  
+  ###.###.#.#.#.#.#.#########.#                                                         ###.#######.###.###########.#  
+AJ..#...#...#.#...#...#.....#.#                                                         #...#.#.#...#...#.#...#.#.#..GX
+  #.#.#########.#.#.#######.#.#                                                         #####.#.#######.#.###.#.#.###  
+  #.....#.#.#.#.#.............#                                                         #...............#...#........DD
+  #######.#.#.###########.###.#                                                         ###.#######.###.#.#.#.#.###.#  
+  #.....................#.#...#                                                         #.......#.....#...#.#.#.#...#  
+  ###.###.#.#.###.#####.#######                                                         #####.#########.###.#.###.###  
+GP..#...#.#.#.#.....#.#...#...#                                                       SG..#...#.....#...#.#.....#...#  
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+  #.#.....#.#.#.#.#.#.....#...#                                                         #.....#.#.#.#...#.#.#...#.#.#  
+  #.#.#####.#########.#######.#                                                         #########.#.###.#.#.#.#####.#  
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+  #.#######.#####.###.###.#####                                                         #.###.#####.#.###.#.###.#####  
+  #.#.#...#...#.....#.#.#.#.#..AJ                                                       #.........#.#.#.#.#.#.....#.#  
+  ###.#.###.#.#########.###.#.#                                                         #.#####.###.#.#.#######.###.#  
+  #.........#.#...#.....#.#.#.#                                                         #...#.....#.#...#.#.#.#.#....LM
+  #########.#.###.#.###.#.#.#.#                                                         #########.#.#.###.#.#.#####.#  
+AA......#.#.#.....#.#...#.....#                                                         #.#.#.#.#.#.#.#...#.#.#.....#  
+  #.#####.#.#.###.#.#.###.#.###                                                         #.#.#.#.#########.#.#.#####.#  
+JO..........#...#...#.....#...#                                                         #.#.......#.#.............#.#  
+  #####.###############.###.#.#                                                         #.#.#.#####.###.###.#.###.#.#  
+  #.#.#...#.........#.#.#.#.#.#                                                       TX....#.............#.#...#...#  
+  #.#.#######.#.#.#.#.###.###.#                                                         #.###.#.###.#####.###########  
+VH......#.....#.#.#.....#...#.#                                                         #.#...#.#...#...#.#.....#...#  
+  #####.#.###########.###.#####                                                         #############.#####.###.#.#.#  
+  #.....#.....#.#.......#.....#                                                         #.#...#...#.#.......#.#.#.#..RZ
+  #.#.#######.#.#######.#.#####                                                         #.###.###.#.###.#.###.#.#.###  
+  #.#...........#.#............FW                                                     RN..#.....#...#.#.#.#.....#...#  
+  #########.###.#.#.###########                                                         #.#.#.###.###.###.#.#####.###  
+  #...#...#.#.....#.#.........#                                                         #...#.............#.......#.#  
+  #.#.#.#################.#.#.#                                                         ###############.###########.#  
+AX..#...#.#...#.#...#...#.#.#..HR                                                     JO............#.#.#...........#  
+  #.#.###.###.#.#.#####.###.#.#                                                         #.#.#####.#.#.###.#.#.#####.#  
+TX..#...#.......#...#.....#.#..EK                                                       #.#...#.#.#.......#.#...#.#..MM
+  ###.#.###.#.#.#.#.###.#.#.###                                                         #.###.#.#######.#.###.###.#.#  
+  #...#.....#.#...#.....#.....#                                                         #.#.#.....#.#...#...#.#.....#  
+  #####.#.#.#####.###.#######.#        R     Y   G           U     A           M S      #.#.#.#.###.#####.#.#.###.#.#  
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\ No newline at end of file
diff --git a/inputs/20s1.txt b/inputs/20s1.txt
new file mode 100644
index 0000000..41d30f0
--- /dev/null
+++ b/inputs/20s1.txt
@@ -0,0 +1,19 @@
+         A           
+         A           
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+             Z       
\ No newline at end of file
diff --git a/inputs/20s2.txt b/inputs/20s2.txt
new file mode 100644
index 0000000..5cdd08a
--- /dev/null
+++ b/inputs/20s2.txt
@@ -0,0 +1,37 @@
+                   A               
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\ No newline at end of file
diff --git a/inputs/20s3.txt b/inputs/20s3.txt
new file mode 100644
index 0000000..754d23b
--- /dev/null
+++ b/inputs/20s3.txt
@@ -0,0 +1,37 @@
+             Z L X W       C                 
+             Z P Q B       K                 
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+  #############.#.#.###.###################  
+               A O F   N                     
+               A A D   M                     
\ No newline at end of file
diff --git a/main.go b/main.go
index f4b640b..ef64316 100644
--- a/main.go
+++ b/main.go
@@ -53,6 +53,7 @@ var dayMap = []day{
 	&days.Day17{},
 	&days.Day18{},
 	&days.Day19{},
+	&days.Day20{},
 }
 
 func main() {