diff --git a/exercises/solved_notebooks/create_unsolved.jl b/exercises/solved_notebooks/create_unsolved.jl
new file mode 100644
index 0000000..449ea27
--- /dev/null
+++ b/exercises/solved_notebooks/create_unsolved.jl
@@ -0,0 +1,36 @@
+"""
+    create_unsolved(file::String; output_path::String = homedir() * "/Downloads")
+
+Make the unsolved version of a notebook.
+
+Cells that contain a line that starts with `#` and contains a "missing" will be changed: 
+all uncommented lines are removed and all commented lines will be then uncommented.
+"""
+function create_unsolved(file::String; output_path::String = homedir() * "/Downloads")
+    lines = readlines(file)
+    cell_start_idxs = findall(occursin.("# ╔═╡", lines))
+    delete_idxs = Int64[]
+    for cell_nr in 1:(length(cell_start_idxs)-1)
+        cell_idxs = (cell_start_idxs[cell_nr]+1):(cell_start_idxs[cell_nr+1]-1)
+        needs_replacement = occursin.(r"^(\s*)\#.*missing", lines[cell_idxs]) |> any
+        
+        needs_replacement && for cell_idx in cell_idxs
+            isempty(lines[cell_idx]) && continue
+            if lines[cell_idx][1] == '#'
+                println(lines[cell_idx])
+                lines[cell_idx] = lines[cell_idx][3:end]
+            else
+                push!(delete_idxs, cell_idx)
+            end
+        end
+    end
+    deleteat!(lines, delete_idxs)
+    
+    output_filename = replace(splitpath(file)[end], "_sol" => "")
+    write(output_path * '/' * output_filename, *(lines .* '\n'...))
+
+    return nothing
+end
+
+file = "P7_sens_uncert/sens_intro_sol.jl"
+create_unsolved(file)
\ No newline at end of file