diff --git a/data/day_16.txt b/data/day_16.txt
new file mode 100644
index 0000000..ddc1596
--- /dev/null
+++ b/data/day_16.txt
@@ -0,0 +1 @@
+020D78804D397973DB5B934D9280CC9F43080286957D9F60923592619D3230047C0109763976295356007365B37539ADE687F333EA8469200B666F5DC84E80232FC2C91B8490041332EB4006C4759775933530052C0119FAA7CB6ED57B9BBFBDC153004B0024299B490E537AFE3DA069EC507800370980F96F924A4F1E0495F691259198031C95AEF587B85B254F49C27AA2640082490F4B0F9802B2CFDA0094D5FB5D626E32B16D300565398DC6AFF600A080371BA12C1900042A37C398490F67BDDB131802928F5A009080351DA1FC441006A3C46C82020084FC1BE07CEA298029A008CCF08E5ED4689FD73BAA4510C009981C20056E2E4FAACA36000A10600D45A8750CC8010989716A299002171E634439200B47001009C749C7591BD7D0431002A4A73029866200F1277D7D8570043123A976AD72FFBD9CC80501A00AE677F5A43D8DB54D5FDECB7C8DEB0C77F8683005FC0109FCE7C89252E72693370545007A29C5B832E017CFF3E6B262126E7298FA1CC4A072E0054F5FBECC06671FE7D2C802359B56A0040245924585400F40313580B9B10031C00A500354009100300081D50028C00C1002C005BA300204008200FB50033F70028001FE60053A7E93957E1D09940209B7195A56BCC75AE7F18D46E273882402CCD006A600084C1D8ED0E8401D8A90BE12CCF2F4C4ADA602013BC401B8C11360880021B1361E4511007609C7B8CA8002DC32200F3AC01698EE2FF8A2C95B42F2DBAEB48A401BC5802737F8460C537F8460CF3D953100625C5A7D766E9CB7A39D8820082F29A9C9C244D6529C589F8C693EA5CD0218043382126492AD732924022CE006AE200DC248471D00010986D17A3547F200CA340149EDC4F67B71399BAEF2A64024B78028200FC778311CC40188AF0DA194CF743CC014E4D5A5AFBB4A4F30C9AC435004E662BB3EF0
diff --git a/data/day_17.txt b/data/day_17.txt
new file mode 100644
index 0000000..51bfbea
--- /dev/null
+++ b/data/day_17.txt
@@ -0,0 +1 @@
+target area: x=156..202, y=-110..-69
diff --git a/data/day_18.txt b/data/day_18.txt
new file mode 100644
index 0000000..d287a80
--- /dev/null
+++ b/data/day_18.txt
@@ -0,0 +1,100 @@
+[[[[4,9],[1,7]],[9,8]],[[7,9],[7,9]]]
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+[[[[4,6],[1,7]],[[6,4],[1,5]]],[3,[9,9]]]
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+[[9,8],[5,[6,[1,8]]]]
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diff --git a/data/day_19.txt b/data/day_19.txt
new file mode 100644
index 0000000..4e496e9
--- /dev/null
+++ b/data/day_19.txt
@@ -0,0 +1,136 @@
+--- scanner 0 ---
+404,-588,-901
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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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diff --git a/data/day_20.txt b/data/day_20.txt
new file mode 100644
index 0000000..23921b7
--- /dev/null
+++ b/data/day_20.txt
@@ -0,0 +1,102 @@
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diff --git a/src/day_16.jl b/src/day_16.jl
new file mode 100644
index 0000000..243e246
--- /dev/null
+++ b/src/day_16.jl
@@ -0,0 +1,73 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+
+function decode_packet(p, o, version)
+	version += parse(Int, p[o:o+2], base=2); o+=3
+	type = parse(Int, p[o:o+2], base = 2); o+=3
+
+	if type == 4
+		v = ""
+		while true
+			tmp = p[o:o+4]; o+=5
+			v *= tmp[2:end]
+			tmp[1] == '0' ? break : continue
+		end
+		value = parse(Int, v, base=2)
+	else
+		length_type = p[o]; o+=1
+		sub_values = []
+		if length_type == '0'
+			length = parse(Int, p[o:o+14], base=2); o+=15
+			target = o + length
+			while o < target
+				v, o, version = decode_packet(p, o, version)
+				push!(sub_values, v)
+			end
+		else
+			num = parse(Int, p[o:o+10], base=2); o+=11
+			for _ in 1:num
+				v, o, version = decode_packet(p, o, version)
+				push!(sub_values, v)
+			end
+		end
+	end
+	
+	if type == 0
+		value = sum(sub_values)
+	elseif type == 1 
+		value = prod(sub_values)
+	elseif type == 2
+		value = minimum(sub_values)
+	elseif type == 3
+		value = maximum(sub_values)
+	elseif type == 5
+		value = sub_values[begin] > sub_values[end] ? 1 : 0
+	elseif type == 6
+		value = sub_values[begin] < sub_values[end] ? 1 : 0
+	elseif type == 7
+		value = sub_values[begin] == sub_values[end] ? 1 : 0
+	end
+	return (value, o, version)
+end
+
+function p1(input::Vector{String})
+	packet = ""
+	for c in input[1]
+		packet *= bitstring(Int8(parse(Int, c, base = 16)))[5:end]
+	end
+	v, _, version = decode_packet(packet, 1, 0)
+	return version
+end
+
+function p2(input::Vector{String})
+	packet = ""
+	for c in input[1]
+		packet *= bitstring(Int8(parse(Int, c, base = 16)))[5:end]
+	end
+	v, _ = decode_packet(packet, 1, 0)
+	return v
+end
+
+@aoc(2021, 16)
diff --git a/src/day_17.jl b/src/day_17.jl
new file mode 100644
index 0000000..dcae6d5
--- /dev/null
+++ b/src/day_17.jl
@@ -0,0 +1,38 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+function solve(input)
+	x1, x2, y1, y2 = parse.(Int, match(r"target area: x=(-?\d+)..(-?\d+), y=(-?\d+)..(-?\d+)", input).captures)
+	total = 0
+	best = 0
+	for vx in isqrt(2x1)+1:x2, vy in y1:abs(y1)
+		x,y,maxy = 0,0,0
+		Δx, Δy = vx, vy
+		found = passed = false
+		while true
+			inside = false
+			x += Δx; y += Δy
+			Δx -= sign(Δx); Δy -= 1
+			y > maxy && (maxy = y)
+			if x in x1:x2 && y in y1:y2
+				inside = true
+				!found && (total += 1); found = true
+				maxy > best  && (best = maxy)
+			end
+			(found && !inside) && break
+			y < y1 && break
+		end
+	end
+	return (best, total)
+end
+
+function p1(input::Vector{String})
+	return solve(input[1])[1]
+end
+
+function p2(input::Vector{String})
+	return solve(input[1])[2]
+end
+
+@aoc(2021, 17)
diff --git a/src/day_18.jl b/src/day_18.jl
new file mode 100644
index 0000000..5b11c6d
--- /dev/null
+++ b/src/day_18.jl
@@ -0,0 +1,69 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+using Combinatorics
+
+function addn(v, n, dir)
+ 	n == nothing && (return v)
+	typeof(v) == Int && (return v+n)
+	if dir == "left"
+		return [addn(v[1], n, "left"), v[2]]
+	else
+		return [v[1], addn(v[2], n, "right")]
+	end
+end
+
+function arrexplode(v, n = 4)
+	typeof(v) == Int && (return (false, nothing, v, nothing))
+	n == 0 && (return true, v[1], 0, v[2])
+
+	l, r = v
+	exploded, t, l, w = arrexplode(l, n-1)
+	exploded && (return true, t, [l, addn(r, w, "left")], nothing)
+	exploded, t, r, w = arrexplode(r, n-1)
+	exploded && (return true, nothing, [addn(l, t, "right"), r], w)
+
+	false, nothing, v, nothing
+end
+
+function arrsplit(v)
+	if typeof(v) == Int
+		v > 9 && (return true, [v ÷ 2, Int(round(v/2, RoundUp))])
+		return false, v
+	end
+	l, r = v
+	changed, l = arrsplit(l)
+	changed && (return true, [l,r])
+	changed, r = arrsplit(r)
+
+	changed, [l,r]
+end
+
+function arradd(l, r)
+	sum = [l,r]
+	while true
+		changed, t, sum, w = arrexplode(sum)
+		changed && continue
+		changed, sum = arrsplit(sum)
+		changed && continue
+		break
+	end
+	sum
+end
+
+function magn(v)
+	typeof(v) == Int && (return v)
+	3*magn(v[1]) + 2*magn(v[2])
+end
+
+function p1(input::Vector{String})
+	numbers = [ eval(Meta.parse(x)) for x in input ]
+	magn(reduce(arradd, numbers))
+end
+
+function p2(input::Vector{String})
+	numbers = [ eval(Meta.parse(x)) for x in input ]
+	maximum([magn(arradd(l,r)) for (l, r) in Combinatorics.permutations(numbers, 2)])
+end
+
+@aoc(2021, 18)
diff --git a/src/day_19.jl b/src/day_19.jl
new file mode 100644
index 0000000..be21d16
--- /dev/null
+++ b/src/day_19.jl
@@ -0,0 +1,86 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+using Combinatorics
+
+function prepare_input(input)
+	dict = []
+	tmp = []
+	for l in input
+		l == "" && continue
+		m = match(r"--- scanner (\d+) ---", l)
+		if m != nothing
+			length(tmp) != 0 && push!(dict, tmp)
+			tmp = []
+			continue
+		end
+		push!(tmp, parse.(Int, split(l, ",")))
+	end
+	dict
+end
+
+function align(a,b, negs, distances)
+	a2 = Set(a)
+	for re in 1:6, neg in negs
+		newb = [ neg .* collect(Combinatorics.permutations(s,3))[re] for s in b ]
+		for p1 in a2, p2 in newb
+			count = 0
+			remapped = []
+			dist = p2 .- p1
+			for b2 in newb
+				to_a = b2 .- dist
+				to_a in a2 && (count += 1)
+				push!(remapped, to_a)
+			end
+			if count >= 12
+				println("match $dist")
+				push!(distances, dist)
+				return true, remapped
+			end
+		end
+	end
+	return false, []
+end
+
+function p1(input::Vector{String})
+	@info "Something is brken. This may take 5 minutes or more to get a slightly wrong result."
+	negations = [
+		[1,1,1],
+		[-1,1,1],
+		[1,-1,1],
+		[1,1,-1],
+		[-1,-1,1],
+		[-1,1,-1],
+		[-1,-1,-1],
+		[1,-1,-1]
+	]
+	list = prepare_input(input)
+	aligned_idx = Set(1)
+	aligned = Dict(1 => list[1])
+	beacons = copy(list[1])
+	dont_align = Set()
+	distances = [[0,0,0]]
+	while length(aligned_idx) < length(list)
+		for i in 1:length(list)
+			i in aligned_idx && continue
+			for j in sort(collect(aligned_idx))
+				println("checking $i against $j")
+				(i,j) in dont_align && continue
+				found, remapped = align(aligned[j], list[i], negations, distances)
+				if found
+					push!(aligned_idx, i)
+					aligned[i] = remapped
+					beacons = vcat(beacons, remapped)
+					break
+				end
+				push!(dont_align, (i,j))
+			end
+		end
+	end
+	return length(beacons)
+end
+
+function p2(input::Vector{String})
+end
+
+@aoc(2021, 19)
diff --git a/src/day_20.jl b/src/day_20.jl
new file mode 100644
index 0000000..fba01bb
--- /dev/null
+++ b/src/day_20.jl
@@ -0,0 +1,60 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+function prepare_input(input)
+	code = [ (c == '#') for c in input[1] ]
+	image = []
+
+	for l in input[3:end]
+		push!(image, [ (c == '#') for c in l ])
+	end
+	code, image
+end
+
+function neighbours(i,j)
+	( (i+y,j+x) for (y, x) in zip([-1,-1,-1,0,0,0,1,1,1], [-1,0,1,-1,0,1,-1,0,1]))
+end
+
+function get_value(image, y, x, bool)
+	( 1 <= y <= length(image)  && 1 <= x <= length(image[1])) && return image[y][x]
+	bool
+end
+
+function apply_alg(image, code, bool)
+	w = length(image[1])
+	h = length(image)
+	newimage = []
+	for y in 0:h+1
+		row = []
+		for x in 0:w+1
+			values = [ get_value(image, y2, x2, bool) for (y2,x2) in neighbours(y, x)]
+			idx = parse(Int, join(map(b->b ? 1 : 0, values)), base=2)
+			push!(row, code[idx+1])
+		end
+		push!(newimage, row)
+	end
+	newimage
+end
+
+function p1(input::Vector{String})
+	code, image = prepare_input(input)
+	bool = false
+	for _ in 1:2
+		image = apply_alg(image, code, bool)
+		bool = !bool
+	end
+	return sum(vcat(image...))
+end
+
+function p2(input::Vector{String})
+	code, image = prepare_input(input)
+	bool = false
+	for _ in 1:50
+		image = apply_alg(image, code, bool)
+		bool = !bool
+	end
+	return sum(vcat(image...))
+end
+
+@aoc(2021, 20)