diff --git a/src/solver.ts b/src/solver.ts
new file mode 100644
index 0000000..f5d61b0
--- /dev/null
+++ b/src/solver.ts
@@ -0,0 +1,97 @@
+import { eStates } from "./utils";
+
+const solverUrl = "http://10.0.0.3:8000/"
+
+/*
+# EXAMPLE DATA FORMAT FOR SOLVER
+# puzzle taken from http://nikoli.com/swf/sl.swf?loadUrl=/nfp/sl-0001.nfp&lang=1
+10 10
+
+....02....
+230....223
+...3..3...
+3...22...1
+.2.2..0.2.
+.2.3..3.3.
+3...10...2
+...2..3...
+303....331
+....02....
+
+# EXAMPLE RESPONSE FORMAT FROM SOLVER
+Puzzle: /ws/Others/slink-solver/input.txt
+. - . - . x . x . x . x . - . x . x . x .
+|   x   |   x   x 0 x 2 |   |   x   x   x
+. x . - . x . x . x . - . x . - . x . - .
+| 2 | 3 x 0 x   x   |   x   x 2 | 2 | 3 |
+. x . - . x . - . x . x . - . x . x . x .
+|   x   |   | 3 |   |   | 3 |   |   |   |
+. - . x . - . x . - . x . x . x . - . x .
+x 3 |   x   x   x 2 x 2 |   |   x   x 1 |
+. - . x . - . - . - . - . x . - . - . x .
+|   x 2 |   x 2 x   x   x 0 x   x 2 |   |
+. - . - . x . - . x . - . x . - . x . x .
+x   x 2 x   | 3 |   |   | 3 |   | 3 |   |
+. - . - . - . x . - . x . - . x . - . x .
+| 3 x   x   x   x 1 x 0 x   x   x   x 2 |
+. - . x . - . - . x . x . - . - . - . - .
+x   |   |   x 2 |   x   | 3 x   x   x   x
+. - . x . - . x . - . x . - . x . - . x .
+| 3 x 0 x 3 |   x   |   x   | 3 | 3 | 1 x
+. - . x . - . x . x . - . x . - . x . x .
+x   |   |   x   x 0 x 2 |   x   x   |   x
+. x . - . x . x . x . x . - . - . - . x .
+Solved
+Total time:     0.053913 seconds
+ */
+
+export async function solve(w: number, h: number, numbers: Int8Array, mask: Int8Array): Promise<[Int8Array, Int8Array]> {
+  const [eRows, eCols] = [w + 1, h + 1]
+
+  // Format data: numbers, mask
+  let req = `# Online Edit\n${w} ${h}\n\n`
+  for (let i = 0; i < h; i++) {
+    for (let j = 0; j < w; j++) {
+      req += mask[i * w + j] ? '.' : numbers[i * w + j]
+    }
+    // IMPORTANT NOTE: The backend is very strict about trailing newlines, if a trailing newline exist,
+    // it would return "invalid puzzle"
+    if (i < h - 1) req += '\n'
+  }
+
+  // Send data to solver
+  let response = await fetch(solverUrl, {
+    method: "post",
+    body: req
+  })
+  // Parse response
+  let data = await response.json()
+  console.log(data)
+
+  let lines = data.split('\n').filter(x => x.length > 0)
+  const [hStates, vStates] = [new Int8Array(eRows * eCols), new Int8Array(eRows * eCols)]
+  let hLines = lines.filter(l => l[0] == '.')
+  let vLines = lines.filter(l => l[0] == '|' || l[0] == 'x')
+  console.log(hLines, vLines, lines)
+
+  const dict: Record<string, number> = {
+    '.': eStates.none,
+    'x': eStates.autoCrossed,
+    '|': eStates.selected,
+    '-': eStates.selected
+  }
+
+  for (let x = 0; x < eRows; x++) {
+    for (let y = 0; y < eCols; y++) {
+      try {
+        hStates[y * eCols + x] = dict[hLines[y][x * 4 + 2]]
+      } catch (e) {}
+      try {
+        vStates[y * eCols + x] = dict[vLines[y][x * 4]]
+      } catch (e) {}
+    }
+  }
+
+  return [hStates, vStates]
+}
+