diff --git a/day14/Project.toml b/day14/Project.toml
new file mode 100644
index 0000000..8709608
--- /dev/null
+++ b/day14/Project.toml
@@ -0,0 +1,4 @@
+name = "day14"
+uuid = "4741208b-2337-4a9b-ac28-da3984274e1f"
+authors = ["HeNine "]
+version = "0.1.0"
diff --git a/day14/data/case00.txt b/day14/data/case00.txt
new file mode 100644
index 0000000..6c1c3a1
--- /dev/null
+++ b/day14/data/case00.txt
@@ -0,0 +1,18 @@
+NNCB
+
+CH -> B
+HH -> N
+CB -> H
+NH -> C
+HB -> C
+HC -> B
+HN -> C
+NN -> C
+BH -> H
+NC -> B
+NB -> B
+BN -> B
+BB -> N
+BC -> B
+CC -> N
+CN -> C
\ No newline at end of file
diff --git a/day14/data/case01.txt b/day14/data/case01.txt
new file mode 100644
index 0000000..03a045f
--- /dev/null
+++ b/day14/data/case01.txt
@@ -0,0 +1,102 @@
+PHOSBSKBBBFSPPPCCCHN
+
+KO -> H
+OK -> P
+BO -> C
+SH -> V
+PC -> F
+NK -> N
+PH -> K
+VH -> S
+NN -> S
+VC -> P
+OF -> O
+HH -> S
+VP -> K
+KP -> O
+NP -> F
+SS -> V
+HP -> S
+PS -> F
+BV -> P
+KS -> H
+SO -> H
+NF -> N
+CO -> V
+HK -> F
+OO -> N
+KN -> F
+SP -> V
+OP -> S
+OV -> V
+HO -> V
+PK -> N
+FF -> N
+CV -> S
+PP -> B
+CF -> P
+HF -> B
+BN -> C
+FH -> S
+ON -> K
+SN -> N
+CP -> N
+OB -> O
+HC -> F
+KH -> P
+OS -> S
+NS -> C
+BK -> H
+PB -> P
+SV -> F
+FV -> C
+BC -> K
+HS -> N
+PF -> V
+NC -> N
+CH -> H
+VF -> H
+KK -> B
+OH -> K
+HB -> C
+SC -> B
+VK -> C
+FP -> C
+SK -> N
+VO -> K
+FB -> S
+KB -> N
+BS -> S
+VS -> C
+CN -> K
+KF -> F
+NB -> O
+BB -> C
+CS -> C
+FC -> K
+NO -> B
+SB -> C
+CB -> N
+BP -> S
+NV -> H
+NH -> N
+PV -> K
+PO -> C
+VB -> O
+FK -> P
+HV -> O
+KC -> S
+VV -> O
+VN -> H
+BH -> K
+FS -> O
+KV -> K
+HN -> P
+OC -> B
+SF -> V
+CC -> F
+CK -> P
+FO -> C
+PN -> K
+BF -> C
+FN -> O
\ No newline at end of file
diff --git a/day14/src/day14.jl b/day14/src/day14.jl
new file mode 100644
index 0000000..b7ac6f8
--- /dev/null
+++ b/day14/src/day14.jl
@@ -0,0 +1,109 @@
+include("../../AoC2021.jl")
+
+##
+
+function parsefile(file)
+    start = readline(file)
+
+    readline(file)
+
+    mapples = eachline(file) .|>
+              (x -> split(x, " -> ")) .|>
+              (x -> (x[1], x[2]))
+
+    mapping = Dict(x => y for (x, y) ∈ mapples)
+
+    (start, mapping)
+end
+
+function hist(string::String)
+    h = Dict()
+
+    for char ∈ collect(string)
+        h[char] = get(h, char, 0) + 1
+    end
+
+    h
+end
+
+##
+
+function task0(file)
+    (poly, mapping) = parsefile(file)
+
+    # display(poly)
+
+    for _ = 1:10
+        newpoly = ""
+        for i ∈ 1:(length(poly)-1)
+            pair = poly[i:(i+1)]
+            newpair = join([pair[1], mapping[pair]])
+            newpoly *= newpair
+        end
+
+        newpoly *= poly[end]
+        # display(newpoly)
+        poly = newpoly
+    end
+
+    h = hist(poly)
+    return maximum(values(h)) - minimum(values(h))
+end
+
+##
+
+verify(14, 1, 0, 1588)
+verify(14, 1, 1, 2874)
+
+##
+
+function hist(pairs::Dict)
+    h = Dict()
+
+    for pair ∈ keys(pairs)
+        # for char ∈ collect(pair)
+            h[pair[1]] = get(h, pair[1], 0) + pairs[pair]
+        # end
+    end
+
+    h
+end
+
+##
+
+function task1(file)
+    (poly, mapping) = parsefile(file)
+
+    # display(poly)
+
+    pairs = Dict()
+
+    for i ∈ 1:(length(poly)-1)
+        pair = poly[i:(i+1)]
+        pairs[pair] = get(pairs, pair, 0) + 1
+    end
+
+    for _ = 1:40
+
+        newpairs = Dict()
+
+        for pair ∈ keys(pairs)
+            lpair = join([pair[1], mapping[pair]])
+            rpair = join([mapping[pair], pair[2]])
+
+            newpairs[lpair] = get(newpairs, lpair, 0) + pairs[pair]
+            newpairs[rpair] = get(newpairs, rpair, 0) + pairs[pair]
+        end
+
+        pairs = newpairs
+    end
+
+    h = hist(pairs)
+    h[poly[end]] += 1
+    return maximum(values(h)) - minimum(values(h))
+end
+
+##
+
+verify(14, 2, 0, 2188189693529)
+verify(14, 2, 1, 5208377027195)
\ No newline at end of file
diff --git a/day15/Project.toml b/day15/Project.toml
new file mode 100644
index 0000000..695382b
--- /dev/null
+++ b/day15/Project.toml
@@ -0,0 +1,7 @@
+name = "day15"
+uuid = "64299dba-311b-4a34-be75-de1458cc66c6"
+authors = ["HeNine "]
+version = "0.1.0"
+
+[deps]
+DataStructures = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
diff --git a/day15/data/case00.txt b/day15/data/case00.txt
new file mode 100644
index 0000000..7d9d562
--- /dev/null
+++ b/day15/data/case00.txt
@@ -0,0 +1,10 @@
+1163751742
+1381373672
+2136511328
+3694931569
+7463417111
+1319128137
+1359912421
+3125421639
+1293138521
+2311944581
\ No newline at end of file
diff --git a/day15/data/case01.txt b/day15/data/case01.txt
new file mode 100644
index 0000000..5c4dcf6
--- /dev/null
+++ b/day15/data/case01.txt
@@ -0,0 +1,100 @@
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\ No newline at end of file
diff --git a/day15/src/day15.jl b/day15/src/day15.jl
new file mode 100644
index 0000000..16fce04
--- /dev/null
+++ b/day15/src/day15.jl
@@ -0,0 +1,70 @@
+include("../../AoC2021.jl")
+
+using DataStructures
+
+##
+
+function parsefile(file)
+    (eachline(file) .|> Base.Fix2(split, "") .|>
+     (x -> parse.(Int, x)) .|>
+     permutedims) |> x -> vcat(x...)
+end
+
+function A★cost(mappe)
+    mappesize = size(mappe)
+    mappeopt = fill(typemax(Int), mappesize)
+    mappeopt[1, 1] = 0
+
+    q = PriorityQueue()
+
+    enqueue!(q, CartesianIndex(1, 1), sum(mappesize) - 2)
+
+    while length(q) > 0
+        (pos, costh) = dequeue_pair!(q)
+
+        cost = costh - ((mappesize[1] - pos[1]) + (mappesize[2] - pos[2]))
+
+        if pos == CartesianIndex(mappesize)
+            return cost
+        end
+
+        for (x, y) ∈ [(-1, 0), (1, 0), (0, 1), (0, -1)]
+            if checkbounds(Bool, mappe, pos + CartesianIndex(y, x))
+                if cost + mappe[pos+CartesianIndex(y, x)] < mappeopt[pos+CartesianIndex(y, x)]
+                    mappeopt[pos+CartesianIndex(y, x)] = cost + mappe[pos+CartesianIndex(y, x)]
+                    q[pos+CartesianIndex(y, x)] = cost +
+                                                  mappe[pos+CartesianIndex(y, x)] +
+                                                  (mappesize[1] - (pos[1] + y)) + (mappesize[2] - (pos[2] + x))
+                end
+            end
+        end
+    end
+end
+
+##
+
+function task0(file)
+    mappe = parsefile(file)
+
+    A★cost(mappe)
+end
+
+##
+
+verify(15, 1, 0, 40)
+verify(15, 1, 1, 769)
+
+##
+
+function task1(file)
+    mappe = parsefile(file)
+    newmappe = kron(ones(5, 5), mappe) .+ kron(collect(0:4)' .+ collect(0:4), ones(size(mappe)))
+    newmappe = (convert.(Int, newmappe) .- 1) .% 9 .+ 1
+
+    A★cost(newmappe)
+end
+
+##
+
+verify(15, 2, 0, 315)
+verify(15, 2, 1, 2963)
\ No newline at end of file