diff --git a/AoC2021.jl b/AoC2021.jl
index 2fcf879..59288a3 100644
--- a/AoC2021.jl
+++ b/AoC2021.jl
@@ -1,3 +1,5 @@
+using Printf
+
 function verify(day, task, case, expresult)
     taskfun = getfield(Main, Symbol("task", task - 1))
     filename = "day$(@sprintf "%02d" day)\\data\\case$(@sprintf "%02d" case).txt"
diff --git a/day11/Project.toml b/day11/Project.toml
new file mode 100644
index 0000000..f2cf869
--- /dev/null
+++ b/day11/Project.toml
@@ -0,0 +1,4 @@
+name = "day11"
+uuid = "eeb063b9-3c05-4ffd-8498-60dcd43cb32f"
+authors = ["HeNine "]
+version = "0.1.0"
diff --git a/day11/data/case00.txt b/day11/data/case00.txt
new file mode 100644
index 0000000..a3819c9
--- /dev/null
+++ b/day11/data/case00.txt
@@ -0,0 +1,10 @@
+5483143223
+2745854711
+5264556173
+6141336146
+6357385478
+4167524645
+2176841721
+6882881134
+4846848554
+5283751526
\ No newline at end of file
diff --git a/day11/data/case01.txt b/day11/data/case01.txt
new file mode 100644
index 0000000..c4a08de
--- /dev/null
+++ b/day11/data/case01.txt
@@ -0,0 +1,10 @@
+7777838353
+2217272478
+3355318645
+2242618113
+7182468666
+5441641111
+4773862364
+5717125521
+7542127721
+4576678341
\ No newline at end of file
diff --git a/day11/src/day11.jl b/day11/src/day11.jl
new file mode 100644
index 0000000..34c6e3d
--- /dev/null
+++ b/day11/src/day11.jl
@@ -0,0 +1,83 @@
+include("../../AoC2021.jl")
+
+##
+
+function parsefile(file)
+    (eachline(file) .|> Base.Fix2(split, "") .|>
+     (x -> parse.(Int, x)) .|>
+     permutedims) |> x -> vcat(x...)
+end
+
+function advancegen(mappe)
+    mappe .+= 1
+
+    reset = []
+
+    topop = findall(mappe .> 9)
+    reset = copy(topop)
+
+    while length(topop) > 0
+
+        o = pop!(topop)
+
+        for ox ∈ -1:1, oy ∈ -1:1
+            mappe[o+CartesianIndex(oy, ox)] += 1
+            if mappe[o+CartesianIndex(oy, ox)] > 9 && o + CartesianIndex(oy, ox) ∉ reset
+                push!(topop, o + CartesianIndex(oy, ox))
+                push!(reset, o + CartesianIndex(oy, ox))
+            end
+        end
+    end
+
+    mappe[reset] .= 0
+    mappe[1, :] .= -9
+    mappe[end, :] .= -9
+    mappe[:, 1] .= -9
+    mappe[:, end] .= -9
+
+    mappe
+end
+
+##
+
+function task0(file)
+    raw_mappe = parsefile(file)::Matrix{Int}
+    mappe = fill(-9, size(raw_mappe) .+ 2)
+    mappe[2:(end-1), 2:(end-1)] = raw_mappe
+
+    popped = 0
+
+    for gen = 1:100
+        mappe = advancegen(mappe)
+        popped += sum(mappe .== 0)
+    end
+    popped
+end
+
+##
+
+verify(11, 1, 0, 1656)
+verify(11, 1, 1, 1721)
+
+##
+
+function task1(file)
+
+    raw_mappe = parsefile(file)::Matrix{Int}
+    mappe = fill(-9, size(raw_mappe) .+ 2)
+    mappe[2:(end-1), 2:(end-1)] = raw_mappe
+
+    gen = 0
+
+    while !all(mappe[2:(end-1), 2:(end-1)] .== 0)
+        gen += 1
+        mappe = advancegen(mappe)
+    end
+
+    gen
+end
+
+##
+
+verify(11, 2, 0, 195)
+verify(11, 2, 1, 298)
\ No newline at end of file