diff --git a/src/App.js b/src/App.js
index 6ca4350..8677d85 100644
--- a/src/App.js
+++ b/src/App.js
@@ -1,12 +1,114 @@
-import React from 'react';
+import React, { useState, useEffect } from 'react';
 
-import { Header } from 'components';
+import { Board, Header } from 'components';
 
 function App() {
+  const [rows, setRows] = useState(10);
+  const [cols, setCols] = useState(10);
+  const [mines, setMines] = useState(5);
+  const [flags, setFlags] = useState(5);
+  const [mounted, setMounted] = useState(false);
+  const [dummyBoard, setDummyBoard] = useState([]);
+  const [updateDummyBoard, setUpdateDummyBoard] = useState(true);
+
+  const handleSetRows = value => {
+    // TODO can't be less than 3
+    setRows(value);
+    setUpdateDummyBoard(true);
+  };
+
+  const handleSetCols = value => {
+    // TODO can't be less than 3
+    setCols(value);
+    setUpdateDummyBoard(true);
+  };
+
+  const generateDummyBoard = () => {
+    const board = [];
+
+    for (let row = 0; row < rows; row++) {
+      board.push(
+        Array(cols)
+          .join(0)
+          .split(0)
+      );
+    }
+
+    setDummyBoard(board);
+  };
+
+  const handleSetMines = event => {
+    // TODO can't be less than 1
+    setMines(parseInt(event.target.value));
+    setFlags(parseInt(event.target.value));
+    generateDummyBoard();
+  };
+
+  useEffect(() => {
+    function bootstrap() {
+      setMounted(true);
+      generateDummyBoard();
+    }
+
+    if (!mounted) {
+      bootstrap();
+    }
+
+    if (updateDummyBoard) {
+      setUpdateDummyBoard(false);
+      generateDummyBoard();
+    }
+  });
+
+  const handleCellClick = (row, col) => {
+    const cell = document.getElementById(`cell_${row}_${col}`);
+    if (cell.classList.contains('flagged')) {
+      return;
+    }
+
+    if (!cell.classList.contains('revealed')) {
+      cell.classList.add('revealed');
+    }
+  };
+
+  const handleCellContextMenu = (event, row, col) => {
+    event.preventDefault();
+    const cell = document.getElementById(`cell_${row}_${col}`);
+    if (cell.classList.contains('revealed')) {
+      return;
+    }
+
+    if (cell.classList.contains('flagged')) {
+      cell.classList.remove('flagged');
+    } else {
+      cell.classList.add('flagged');
+    }
+  };
+
+  if (!mounted) {
+    return null;
+  }
+
   return (
     <div className="app">
       <div className="canvas">
-        <Header />
+        <Header
+          cols={cols}
+          flags={flags}
+          handleSetMines={handleSetMines}
+          mines={mines}
+          rows={rows}
+          setCols={handleSetCols}
+          setMines={setMines}
+          setRows={handleSetRows}
+        />
+        <Board
+          cols={cols}
+          dummyBoard={dummyBoard}
+          handleCellClick={handleCellClick}
+          handleCellContextMenu={handleCellContextMenu}
+          rows={rows}
+        />
       </div>
     </div>
   );
diff --git a/src/assets/images/flag.svg b/src/assets/images/flag.svg
new file mode 100644
index 0000000..955a5a0
--- /dev/null
+++ b/src/assets/images/flag.svg
@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16.439" height="15.031" viewBox="0 0 16.439 15.031">
+  <line id="Line_6" data-name="Line 6" y2="13" transform="translate(5.259 1.531)" fill="none" stroke="#000" stroke-linecap="round" stroke-width="1"/>
+  <g id="Polygon_2" data-name="Polygon 2" transform="matrix(-0.657, 0.293, 0.752, 0.308, 11.211, -0.035)" fill="red">
+    <path d="M 15.6063289642334 6.5 L 1.393670678138733 6.5 L 8.5 0.6477288007736206 L 15.6063289642334 6.5 Z" stroke="none"/>
+    <path d="M 8.5 1.295455932617188 L 2.787339210510254 6 L 14.21266078948975 6 L 8.5 1.295455932617188 M 8.5 0 L 17 7 L 0 7 L 8.5 0 Z" stroke="none"/>
+  </g>
+</svg>
diff --git a/src/assets/scss/_variables.scss b/src/assets/scss/_variables.scss
index 2aa1e95..7148243 100644
--- a/src/assets/scss/_variables.scss
+++ b/src/assets/scss/_variables.scss
@@ -3,3 +3,5 @@ $gray-mid: #e3e3e3;
 $gray-dark: #333;
 $gray: #d1d1d1;
 $red: #ec433c;
+
+$cell-size: 20px;
diff --git a/src/assets/scss/styles.scss b/src/assets/scss/styles.scss
index a9d5e5e..1a0fe73 100644
--- a/src/assets/scss/styles.scss
+++ b/src/assets/scss/styles.scss
@@ -4,18 +4,19 @@
 body {
   font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
   font-size: 14px;
-  background-color: $gray-light;
+
+  background-color: $gray-mid;
 }
 
 .canvas {
   max-width: 1000px;
   width: 100%;
   min-width: 500px;
-  background-color: $gray-mid;
   margin: 0 auto;
   border-radius: 3px;
   display: flex;
   justify-content: center;
+  flex-direction: column;
 }
 
 .box {
diff --git a/src/components/Board/Board.js b/src/components/Board/Board.js
index 88e9e60..4298ef8 100644
--- a/src/components/Board/Board.js
+++ b/src/components/Board/Board.js
@@ -1,8 +1,37 @@
 import React from 'react';
+import PropTypes from 'prop-types';
+
 import './styles.scss';
 
-const Board = () => {
-  return <div className="board">Board here</div>;
+const Board = ({ dummyBoard, handleCellClick, handleCellContextMenu }) => {
+  return (
+    <div className="board">
+      {dummyBoard.map((cols, rowId) => (
+        <div className="board-row" key={`row_${rowId}`}>
+          {cols.map((col, colId) => (
+            <div
+              className="board-row-cell box"
+              id={`cell_${rowId}_${colId}`}
+              onClick={() => handleCellClick(rowId, colId)}
+              onContextMenu={event =>
+                handleCellContextMenu(event, rowId, colId)
+              }
+              key={`cell_${rowId}_${colId}`}>
+              {' '}
+            </div>
+          ))}
+        </div>
+      ))}
+    </div>
+  );
+};
+
+Board.propTypes = {
+  cols: PropTypes.number.isRequired,
+  dummyBoard: PropTypes.array.isRequired,
+  handleCellClick: PropTypes.func.isRequired,
+  rows: PropTypes.number.isRequired,
+  handleCellContextMenu: PropTypes.func.isRequired
 };
 
 export default Board;
diff --git a/src/components/Board/styles.scss b/src/components/Board/styles.scss
index 04999c1..bbda6e0 100644
--- a/src/components/Board/styles.scss
+++ b/src/components/Board/styles.scss
@@ -1 +1,27 @@
 @import '../../assets/scss/variables';
+
+.board {
+  display: flex;
+  flex-direction: column;
+  &-row {
+    display: flex;
+    justify-content: center;
+
+    &-cell.flagged {
+      background-image: url(../../assets/images/flag.svg);
+      background-repeat: no-repeat;
+      background-position: center center;
+    }
+
+    &-cell.revealed {
+      margin: 1px;
+      border: 2px solid $gray-dark;
+    }
+
+    &-cell {
+      width: $cell-size;
+      height: $cell-size;
+      line-height: $cell-size;
+    }
+  }
+}
diff --git a/src/components/Header/Header.js b/src/components/Header/Header.js
index b5f3af7..11d39e9 100644
--- a/src/components/Header/Header.js
+++ b/src/components/Header/Header.js
@@ -1,95 +1,69 @@
-import React, { useState } from 'react';
+import React from 'react';
+import PropTypes from 'prop-types';
+
 import './styles.scss';
 
-const difficulty = {
-  custom: {
-    rows: 10,
-    cols: 10,
-    mines: 5,
-    flags: 5
-  },
-  beginner: {
-    rows: 20,
-    cols: 20,
-    mines: 5,
-    flags: 5
-  },
-  intermediate: {
-    rows: 50,
-    cols: 50,
-    mines: 15,
-    flags: 15
-  },
-  expert: {
-    rows: 100,
-    cols: 100,
-    mines: 50,
-    flags: 50
-  }
-};
-
-const Header = () => {
-  const [selectedDifficulty, setSelectedDifficulty] = useState('beginner');
-  const [rows, setRows] = useState(difficulty.beginner.rows);
-  const [cols, setCols] = useState(difficulty.beginner.cols);
-  const [mines, setMines] = useState(difficulty.beginner.mines);
-  const [flags, setFlags] = useState(5);
-  const [resetContent] = useState('🙂');
-
-  const handleSetDifficulty = event => {
-    setSelectedDifficulty(event.target.value);
-    setRows(difficulty[event.target.value].rows);
-    setCols(difficulty[event.target.value].cols);
-    setMines(difficulty[event.target.value].mines);
-    setFlags(difficulty[event.target.value].flags);
-  };
-
-  const handleSetMines = event => {
-    setMines(parseInt(event.target.value));
-    setFlags(parseInt(event.target.value));
-  };
-
+const Header = ({
+  cols,
+  flags,
+  handleSetMines,
+  mines,
+  rows,
+  setCols,
+  setRows
+}) => {
   return (
     <div className="header">
       <div className="flags led-panel box">{flags}</div>
       <div className="settings">
-        {selectedDifficulty === 'custom' && (
-          <div className="custom">
-            <input
-              className="box"
-              onChange={event => setRows(parseInt(event.target.value))}
-              type="number"
-              value={rows}
-            />
-            <input
-              className="box"
-              onChange={event => setCols(parseInt(event.target.value))}
-              type="number"
-              value={cols}
-            />
-            <input
-              className="box"
-              onChange={event => handleSetMines(event)}
-              type="number"
-              value={mines}
-            />
-          </div>
-        )}
-        <select
-          className="box"
-          onChange={event => handleSetDifficulty(event)}
-          value={selectedDifficulty}>
-          <option value="custom">Custom</option>
-          <option value="beginner">Beginner</option>
-          <option value="intermediate">Intermediate</option>
-          <option value="expert">Expert</option>
-        </select>
+        <div className="custom">
+          <input
+            className="box"
+            onChange={event => setRows(parseInt(event.target.value))}
+            type="number"
+            value={rows}
+          />
+          <input
+            className="box"
+            onChange={event => setCols(parseInt(event.target.value))}
+            type="number"
+            value={cols}
+          />
+          <input
+            className="box"
+            onChange={event => handleSetMines(event)}
+            type="number"
+            value={mines}
+          />
+        </div>
       </div>
 
-      <div className="reset box">{resetContent}</div>
+      <div
+        className="reset box"
+        onMouseDown={event => {
+          event.target.innerHTML = '😮';
+          console.log('onmousedown');
+        }}
+        onMouseUp={event => {
+          event.target.innerHTML = '🙂';
+          console.log('onMouseUp');
+        }}>
+        🙂
+      </div>
       <div className="timer led-panel box">000</div>
     </div>
   );
 };
 
+Header.propTypes = {
+  cols: PropTypes.number,
+  flags: PropTypes.number,
+  handleSetMines: PropTypes.func.isRequired,
+  mines: PropTypes.number,
+  rows: PropTypes.number,
+  setCols: PropTypes.func.isRequired,
+  setMines: PropTypes.func.isRequired,
+  setRows: PropTypes.func.isRequired
+};
+
 export default Header;
diff --git a/src/components/Header/styles.scss b/src/components/Header/styles.scss
index 312ec79..9d645d3 100644
--- a/src/components/Header/styles.scss
+++ b/src/components/Header/styles.scss
@@ -6,6 +6,7 @@
   display: flex;
   justify-content: space-between;
   padding: 5px;
+  margin: 0 auto;
 
   .led-panel {
     font-family: 'Space Mono', monospace;