diff --git a/README.md b/README.md
index 6e0b386..4b21c59 100644
--- a/README.md
+++ b/README.md
@@ -8,10 +8,10 @@ This project can also be run using the amazing [CraftOS-PC emulator](https://git
 ## Progress
 
 <!-- calendar-start -->
-#### Stars: 2/24
+#### Stars: 3/24
 
 |Mon|Tue|Wed|Thu|Fri|Sat|Sun|
 |:-:|:-:|:-:|:-:|:-:|:-:|:-:|
-|1<br>:star::star:|2<br>|3<br>|4<br>|5<br>|6<br>|7<br>|
+|1<br>:star::star:|2<br>:star:|3<br>|4<br>|5<br>|6<br>|7<br>|
 |8<br>|9<br>|10<br>|11<br>|12<br>|||
 <!-- calendar-end -->
diff --git a/res/examples/day02.txt b/res/examples/day02.txt
new file mode 100644
index 0000000..b3dc7c4
--- /dev/null
+++ b/res/examples/day02.txt
@@ -0,0 +1,3 @@
+11-22,95-115,998-1012,1188511880-1188511890,222220-222224,
+1698522-1698528,446443-446449,38593856-38593862,565653-565659,
+824824821-824824827,2121212118-2121212124
\ No newline at end of file
diff --git a/res/stats.json b/res/stats.json
index 08df9c6..f981806 100644
--- a/res/stats.json
+++ b/res/stats.json
@@ -4,7 +4,7 @@
         "puzzle2": true
     },
     "day02": {
-        "puzzle1": false,
+        "puzzle1": true,
         "puzzle2": false
     },
     "day03": {
diff --git a/src/day02/puzzle1.lua b/src/day02/puzzle1.lua
new file mode 100644
index 0000000..073f4f8
--- /dev/null
+++ b/src/day02/puzzle1.lua
@@ -0,0 +1,38 @@
+local utils = require "utils"
+local puzzle1 = {}
+
+function puzzle1.splitRange(range)
+    local parts = utils.split(range, "-")
+    return tonumber(parts[1]), tonumber(parts[2])
+end
+
+function puzzle1.isValid(id)
+    local str = tostring(id)
+    if #str % 2 == 1 then
+        return true
+    end
+    local mid = #str / 2
+    return str:sub(1, mid) ~= str:sub(mid + 1)
+end
+
+function puzzle1.countInvalids(range)
+    local min, max = puzzle1.splitRange(range)
+    local total = 0
+    for i=min, max do
+        if not puzzle1.isValid(i) then
+            total = total + i
+        end
+    end
+    return total
+end
+
+function puzzle1.solve(input)
+    local ranges = utils.split(input, ",")
+    local total = 0
+    for _, range in ipairs(ranges) do
+        total = total + puzzle1.countInvalids(range)
+    end
+    return total
+end
+
+return puzzle1
diff --git a/src/day02/puzzle2.lua b/src/day02/puzzle2.lua
new file mode 100644
index 0000000..2f4bc9a
--- /dev/null
+++ b/src/day02/puzzle2.lua
@@ -0,0 +1,7 @@
+local puzzle2 = {}
+
+function puzzle2.solve(input)
+    return 0
+end
+
+return puzzle2
diff --git a/src/lib/utils.lua b/src/lib/utils.lua
index 3ae6ea4..38bd219 100644
--- a/src/lib/utils.lua
+++ b/src/lib/utils.lua
@@ -78,14 +78,18 @@ function utils.waitForKey(targetKey)
     end
 end
 
-function utils.splitLines(data)
+function utils.split(data, sep)
     local t = {}
-    for str in string.gmatch(data, "([^\n]+)") do
+    for str in string.gmatch(data, "([^" .. sep .. "]+)") do
         table.insert(t, str)
     end
     return t
 end
 
+function utils.splitLines(data)
+    return utils.split(data, "\n")
+end
+
 function utils.round(x)
     return x >= 0 and math.floor(x + 0.5) or math.ceil(x - 0.5)
 end