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HTML

              
                <div id="root"></div>
              
            
!

CSS

              
                body {
  margin: 0;
}

#root {
  min-width: 100vw;
  min-height: 100vh;
  height: calc(100vw + 500px);
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  background: #f3f3f3;
}

@media (min-width: 530px) {
  #root {
    height: 770px;
  }
}

.simon-game {
  width: calc(100vw - 30px);
  max-width: 500px;
  height: calc(100vw - 30px);
  max-height: 500px;
  position: relative;
  border-radius: 50%;
  font-family: sans-serif;
}

.simon-game__buttons {
  width: 100%;
  height: 100%;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
  border-radius: 50%;
}

button {
  outline: none;
  cursor: pointer;
}

.simon-game__button {
  width: 50%;
  height: 50%;
  border: 10px solid #141318;
  margin: 0;
}

.simon-game__button--0 {
  border-top-width: 20px;
  border-left-width: 20px;
  border-top-left-radius: 100%;
  background: #2dbd4e;
}

.simon-game__button--0.is-lit {
  background: #33ff88;
}

.simon-game__button--1 {
  border-top-width: 20px;
  border-right-width: 20px;
  border-top-right-radius: 100%;
  background: #f83a08;
}

.simon-game__button--1.is-lit {
  background: #ff7257;
}

.simon-game__button--2 {
  border-bottom-width: 20px;
  border-left-width: 20px;
  border-bottom-left-radius: 100%;
  background: #e9d72b;
}

.simon-game__button--2.is-lit {
  background: #ffff66;
}

.simon-game__button--3 {
  border-bottom-width: 20px;
  border-right-width: 20px;
  border-bottom-right-radius: 100%;
  background: #2484e8;
}

.simon-game__button--3.is-lit {
  background: #33f1ff;
}

.simon-game__settings {
  width: 225px;
  height: 225px;
  position: absolute;
  left: 50%;
  top: -130px;
  -webkit-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: #141318;
  text-align: center;
}

@media (min-width: 530px) {
  .simon-game__settings {
    top: 50%;
  }
}

.simon-game__heading {
  display: inline-block;
  position: relative;
  margin: 32px 0 0;
  text-align: center;
  font-family: 'Audiowide', sans-serif;
  font-size: 40px;
  font-weight: 400;
  color: #fff;
}

.simon-game__heading > sub {
  position: absolute;
  right: -17px;
  bottom: 2px;
  margin: 0;
  font-size: 24px;
}

.simon-game__settings-middle-row {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: end;
      -ms-flex-align: end;
          align-items: flex-end;
}

.simon-game__settings-group {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-pack: end;
      -ms-flex-pack: end;
          justify-content: flex-end;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  text-align: center;
}

.simon-game__settings-count-display {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  width: 70px;
  height: 45px;
  border-radius: 5px;
  background: #380f14;
  font-size: 24px;
  letter-spacing: 0.1em;
  color: #cd4e5d;
}

.simon-game__settings-label {
  display: inline-block;
  margin: 8px 0 12px;
  font-size: 12px;
  text-transform: uppercase;
  color: #fff;
}

.simon-game__settings-group--start-button {
  margin-left: 15px;
  margin-right: 15px;
}

.simon-game__settings-button {
  width: 30px;
  height: 30px;
  border: none;
  border-radius: 50%;
}

.simon-game__settings-button--start {
  margin-bottom: 7px;
  background: #50bb43;
}

.simon-game__settings-strict-mode-indicator {
  width: 10px;
  height:10px;
  border: 2px solid #380f14;
  border-radius: 50%;
  margin-bottom: 5px;
  background: #380f14;
}

.simon-game__settings-strict-mode-indicator.is-lit {
  background: #cd4e5d;
}

.simon-game__settings-button--strict {
  margin-bottom: 7px;
  background: #f2df49;
}

.simon-game__settings-bottom-row {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

.simon-game__settings-power-button {
  position: relative;
  width: 66px;
  height: 30px;
  border: none;
  margin-left: 8px;
  margin-right: 8px;
  background: #333;
}

.simon-game__settings-power-button:before {
  content: '';
  display: block;
  width: 30px;
  height: 24px;
  position: absolute;
  left: 3px;
  top: 3px;
  background: #0b6bcf;
  transition: left 0.3s ease;
}

.simon-game__settings-power-button.is-on:before {
  left: 33px;
}

.simon-game__settings-bottom-row-label {
  font-size: 12px;
  text-transform: uppercase;
  color: #fff;
}

.simon-game__instructions {
  margin-top: 2em;
  text-align: center;
}

.simon-game__attribution {
  width: 100vw;
  position: absolute;
  left: 50%;
  bottom: -60px;
  -webkit-transform: translate(-50%, 100%);
  -ms-transform: translate(-50%, 100%);
  transform: translate(-50%, 100%);
  box-sizing: border-box;
  padding-left: 15px;
  padding-right: 15px;
  background: #f3f3f3;
  text-align: center;
  font-size: 14px;
  line-height: 1.4;
}

.simon-game__attribution-line > a {
  color: #002171;
}

              
            
!

JS

              
                const { createContext, useContext, useReducer, useRef, useEffect, useCallback } = React;
const MAX_SERIES = 20;
let timers = [];
const sounds = Array(4).fill(null).map((val, i) => new Audio(`https://s3.amazonaws.com/freecodecamp/simonSound${i + 1}.mp3`));
sounds.push(new Audio('https://s3.us-east-2.amazonaws.com/vitamindigitalmediaassets/Wrong-answer-sound-effect.mp3'));
sounds.push(new Audio('https://s3.us-east-2.amazonaws.com/vitamindigitalmediaassets/ta-da.mp3'));
const GameContext = createContext({
  state: null,
  dispatch: null,
  handleClick: () => {},
  handleStartButtonClick: () => {},
});

const generateSeries = () => new Array(MAX_SERIES).fill(null).map(item => (
  Math.floor(Math.random() * 4)
));

const reducer = (state, action) => {
  switch (action.type) {
    case 'TURN_ON':
      return {
        ...state,
        isOn: true,
      };
    
    case 'TURN_OFF':
      return {
        ...state,
        isOn: false,
      };
    
    case 'START_PLAYING':
      return {
        ...state,
        isPlaying: true,
      };
    
    case 'STOP_PLAYING':
      return {
        ...state,
        isPlaying: false,
      };
    
    case 'SET_STRICT_MODE':
      return {
        ...state,
        isStrictMode: true,
      };
    
    case 'SET_NORMAL_MODE':
      return {
        ...state,
        isStrictMode: false,
      };
    
    case 'SET_PLAYERS_TURN':
      return {
        ...state,
        isPlayersTurn: true,
      };
    
    case 'SET_COMPUTERS_TURN':
      return {
        ...state,
        isPlayersTurn: false,
      };
    
    case 'SET_COUNT':
      return {
        ...state,
        count: action.payload,
      };
    
    case 'CREATE_NEW_SERIES':
      return {
        ...state,
        series: generateSeries(),
      };
    
    case 'SET_CLICKED_SERIES':
      return {
        ...state,
        clickedSeries: action.payload,
      };
    
    case 'SET_LIT_BUTTON_INDEX':
      return {
        ...state,
        litButtonIndex: action.payload,
      };
    
    case 'SET_IS_INCORRECT':
      return {
        ...state,
        isIncorrect: true,
      };
      
    case 'SET_IS_INCORRECT_IF_IDLE_WITHOUT_CLICK':
      return {
        ...state,
        isIncorrect: state.isPlayersTurn && state.clickedSeries.length === 0,
      };
      
    case 'SET_IS_INCORRECT_IF_IDLE_AFTER_CLICK':
      return {
        ...state,
        isIncorrect: state.isPlayersTurn && state.clickedSeries.length === action.payload + 1,
      };
      
    case 'SET_IS_INCORRECT_IF_INCORRECT':
      return {
        ...state,
        isIncorrect: state.isPlayersTurn && state.clickedSeries.join('') !== state.series.slice(0, state.clickedSeries.length).join(''),
      };
    
    case 'SET_IS_CORRECT':
      return {
        ...state,
        isIncorrect: false,
      };
      
    case 'MARK_CELEBRATED':
      return {
        ...state,
        celebrated: true,
      };
      
    case 'UNMARK_CELEBRATED':
      return {
        ...state,
        celebrated: false,
      };
    
    default:
      return state;
  }
};

const INITIAL_STATE = {
  isOn: false,
  isPlaying: false,
  isStrictMode: false,
  isPlayersTurn: false,
  count: 1,
  series: generateSeries(),
  clickedSeries: [],
  litButtonIndex: null,
  isIncorrect: false,
  celebrated: false,
};

const SimonGame = () => {
  const [state, dispatch] = useReducer(reducer, INITIAL_STATE);
  const indicateErrorIfIdleWithoutClick = useCallback(() => {
    timers.push(setTimeout(() => {
      dispatch({
        type: 'SET_IS_INCORRECT_IF_IDLE_WITHOUT_CLICK',
      });
    }, 5000));
  }, []);
  
  const indicateClick = useCallback(i => {
    if (!state.isOn || !state.isPlaying) {
      return;
    }
    
    dispatch({
      type: 'SET_LIT_BUTTON_INDEX',
      payload: i,
    });
    
    sounds[i].play();
  }, [state.isOn, state.isPlaying]);
  
  const clickAtInterval = useCallback(i => {
    const { isOn, isPlaying, series, count } = state;
    if (!isOn || !isPlaying || count > MAX_SERIES) {
      return;
    }
            
    const thisSeries = series.slice(0, count);
    if (i === thisSeries.length) {
      dispatch({
        type: 'SET_PLAYERS_TURN',
      });
    } else {
      timers.push(setTimeout(() => {
        indicateClick(thisSeries[i++]);
        timers.push(setTimeout(() => {
          dispatch({
            type: 'SET_LIT_BUTTON_INDEX',
            payload: null,
          });
          
          clickAtInterval(i);
        }, 500));
      }, 350));
    }
  }, [state.isOn, state.isPlaying, state.series, state.count, indicateClick]);
  
  const runSeries = useCallback(count => {
    if (state.isOn && state.isPlaying && count <= MAX_SERIES) {
      console.log('rs', count)
      dispatch({
        type: 'SET_COMPUTERS_TURN',
      });
   
      timers.push(setTimeout(() => {
        dispatch({
          type: 'SET_IS_CORRECT',
        });
        
        clickAtInterval(0);
      }, 3000));
    }
  }, [state.isOn, state.isPlaying, clickAtInterval]);
  
  const clearTimers = useCallback(() => {
    timers.forEach(timer => clearTimeout(timer));
    timers = [];
  }, []);
  
  const indicateErrorIfIdleAfterClick = useCallback(oldClickedSeriesLength => {
    timers.push(setTimeout(() => {
      dispatch({
        type: 'SET_IS_INCORRECT_IF_IDLE_AFTER_CLICK',
        payload: oldClickedSeriesLength,
      });
    }, 5000));
  }, []);
  
  const generateNewSettingsForErrorInStrictMode = useCallback(() => {
    dispatch({ type: 'SET_COMPUTERS_TURN' });
    dispatch({ type: 'CREATE_NEW_SERIES' });
    dispatch({ type: 'SET_COUNT', payload: 1 });
    dispatch({ type: 'UNMARK_CELEBRATED' });
    dispatch({ type: 'SET_CLICKED_SERIES', payload: [] });
    dispatch({ type: 'SET_LIT_BUTTON_INDEX', payload: null });
  }, []);
  
  const handleClick = i => {
    const { isOn, isPlaying, isPlayersTurn, clickedSeries } = state;
    if (isOn && isPlaying && isPlayersTurn) {
      clearTimers();
      indicateClick(i);
      timers.push(setTimeout(() => {
        dispatch({
          type: 'SET_CLICKED_SERIES',
          payload: [...clickedSeries, i],
        });
        
        dispatch({
          type: 'SET_LIT_BUTTON_INDEX',
          payload: null,
        });        
        indicateErrorIfIdleAfterClick(clickedSeries.length);
      }, 350));
    }
  };
  
  const generateNewSettings = useCallback(() => {
    generateNewSettingsForErrorInStrictMode();
    dispatch({ type: 'SET_IS_CORRECT' });
  }, [generateNewSettingsForErrorInStrictMode]);
  
  const indicateError = useCallback(() => {
    sounds[4].play();
  }, []);  
  
  const indicateErrorAndRestartInStrictMode = useCallback(() => {
    if (state.isStrictMode) {
      clearTimers();
      indicateError();
      generateNewSettingsForErrorInStrictMode();      
    }
  }, [state.isStrictMode, clearTimers, indicateError, generateNewSettingsForErrorInStrictMode]);
  
  const repeatSeries = useCallback(() => {
    dispatch({
      type: 'SET_CLICKED_SERIES',
      payload: [],
    });
  }, []);
  
  const indicateErrorAndRepeatSeriesInNonStrictMode = useCallback(() => {
    if (!state.isStrictMode) {
      clearTimers();
      indicateError();
      repeatSeries();
    }
  }, [state.isStrictMode, clearTimers, indicateError, repeatSeries]);
  
  const indicateErrorIfIncorrect = useCallback(() => {
    dispatch({ type: 'SET_IS_INCORRECT_IF_INCORRECT' });
  }, []);
  
  const startNextSeriesIfCorrect = useCallback(() => {
    const { clickedSeries, count, series } = state;
    if (clickedSeries.length === count && series.slice(0, count).join('') === clickedSeries.join('')) {
      clearTimers();
      dispatch({ type: 'SET_COUNT', payload: count + 1 });
      dispatch({ type: 'SET_CLICKED_SERIES', payload: [] });
    } 
  }, [state.clickedSeries, state.count, state.series, clearTimers]);
  
  const startGame = () => {
    dispatch({ type: 'START_PLAYING' });
    dispatch({ type: 'SET_COUNT', payload: 1 });
  };
  
  const restartGame = useCallback(() => {
    clearTimers();
    generateNewSettings();
  }, [clearTimers, generateNewSettings]);
  
  const celebrateIfGameWonAndRestart = useCallback(count => {
    const { series, celebrated } = state;
    if (count === MAX_SERIES + 1 && !celebrated) {
      let intervalId = setInterval(() => {
        dispatch({
          type: 'SET_LIT_BUTTON_INDEX',
          payload: null,
        });
        
        timers.push(setTimeout(() => {
          dispatch({
            type: 'SET_LIT_BUTTON_INDEX',
            payload: series[series.length - 1],
          });
          
          dispatch({
            type: 'MARK_CELEBRATED',
          });
        }, 175));
      }, 350);
      
      sounds[5].play();
      timers.push(setTimeout(() => {
        clearInterval(intervalId);
        restartGame();
      }, 3000));
    }
  }, [state.series, state.celebrated, restartGame]);
  
  const handleStartButtonClick = () => {
    const { isOn, isPlaying } = state;
    if (isOn && !isPlaying) {
      startGame();
    } else if (isOn) {
      restartGame();
    }
  };
  
  const toggleIsLitClassForStrictModeIndicator = () => {
    return state.isStrictMode ? ' is-lit' : '';
  };
  
  const handleStrictModeButtonClick = () => {
    const { isOn, isStrictMode } = state; 
    if (isOn) {
      if (isStrictMode) {
        dispatch({ type: 'SET_NORMAL_MODE' });
      } else {
        dispatch({ type: 'SET_STRICT_MODE' });
      }
    }
  };
  
  const toggleIsOnClass = () => {
    return state.isOn ? ' is-on' : '';
  };
  
  const powerOff = () => {
    clearTimers();
    dispatch({ type: 'TURN_OFF' });
    dispatch({ type: 'STOP_PLAYING' });
    dispatch({ type: 'SET_NORMAL_MODE' });
    generateNewSettings();
  };
  
  const handlePowerButtonClick = () => {
    if (state.isOn) {
      powerOff();
    } else {
      dispatch({ type: 'TURN_ON' });
    }
  };
  
  useEffect(() => {
    const { isOn, isPlaying, clickedSeries, count } = state;
    if (isOn && isPlaying && clickedSeries.length === 0) {
      runSeries(count);
    }
  }, [state.isOn, state.isPlaying, state.count, state.clickedSeries, state.clickedSeries, runSeries]);
  
  useEffect(() => {
    if (state.isOn && state.isPlaying) {
      celebrateIfGameWonAndRestart(state.count);
    }
  }, [state.isOn, state.isPlaying, state.count, celebrateIfGameWonAndRestart]);
  
  useEffect(() => {
    if (state.isPlayersTurn) {
      indicateErrorIfIdleWithoutClick();
    }
  }, [state.isPlayersTurn, indicateErrorIfIdleWithoutClick, clearTimers]);
      
  useEffect(() => {
    const { isOn, isPlaying, isIncorrect } = state;
    if (isOn && isPlaying && isIncorrect) {
      indicateErrorAndRestartInStrictMode();
      indicateErrorAndRepeatSeriesInNonStrictMode();
    }
  }, [state.isOn, state.isPlaying, state.isIncorrect, indicateErrorAndRestartInStrictMode, indicateErrorAndRepeatSeriesInNonStrictMode]);
    
  useEffect(() => {
    if (state.isOn && state.isPlaying && state.clickedSeries.length > 0) {
      indicateErrorIfIncorrect();
      startNextSeriesIfCorrect();
    }
  }, [state.isOn, state.isPlaying, state.clickedSeries, indicateErrorIfIncorrect, startNextSeriesIfCorrect, clearTimers]);
  
  return (
    <GameContext.Provider value={{ state, dispatch, handleClick, handleStartButtonClick }}>
      <div className="simon-game">
        <Buttons />
        <Settings
          toggleIsLitClassForStrictModeIndicator={toggleIsLitClassForStrictModeIndicator}
          handleStrictModeButtonClick={handleStrictModeButtonClick}
          toggleIsOnClass={toggleIsOnClass}
          handlePowerButtonClick={handlePowerButtonClick}
        />
        <Instructions />
        <Attribution />
      </div>
    </GameContext.Provider>
  );
};

const Buttons = props => {
  const { state, handleClick } = useContext(GameContext);
  const toggleIsLitClassForButton = i => i === state.litButtonIndex ? 'is-lit' : '';
  return (
    <div className="simon-game__buttons">{Array(4).fill(null).map((val, i) => (<button className={`simon-game__button simon-game__button--${i} ${toggleIsLitClassForButton(i)}`} key={i} onClick={() => handleClick(i)}></button>))}</div>
  );
};

const Settings = props => {
  const { state, handleStartButtonClick } = useContext(GameContext);
  const displayCount = () => {
    const { isOn, isPlaying, isIncorrect, count } = state;
    if (isOn) {
      if (!isPlaying) {
        return '--';
      }
      
      if (isIncorrect) {
        return '!!';
      }
      
      if (count === MAX_SERIES + 1) {
        return '**';
      }
      
      return count < 10 ? `0${count}` : count;
    }
  };
  
  return (
    <div className="simon-game__settings">
      <h1 className="simon-game__heading">SIMON<sub>&reg;</sub></h1>
      <div className="simon-game__settings-middle-row">
        <div className="simon-game__settings-group simon-game__settings-group--count-display">
          <div className="simon-game__settings-count-display">{displayCount()}</div>
          <p className="simon-game__settings-label">Count</p>
        </div>
        <div className="simon-game__settings-group simon-game__settings-group--start-button">
          <button className="simon-game__settings-button simon-game__settings-button--start" onClick={handleStartButtonClick}></button>
          <p className="simon-game__settings-label">Start</p>
        </div>
        <div className="simon-game__settings-group simon-game__settings-group--strict-button">
          <div className={`simon-game__settings-strict-mode-indicator${props.toggleIsLitClassForStrictModeIndicator()}`}></div>
          <button 
            className="simon-game__settings-button simon-game__settings-button--strict"
            onClick={props.handleStrictModeButtonClick}
          ></button>
          <p className="simon-game__settings-label">Strict</p>
        </div>
      </div>
      <div className="simon-game__settings-bottom-row">
        <span className="simon-game__settings-bottom-row-label simon-game__settings-bottom-row-label--left">Off</span>
        <button 
          className={`simon-game__settings-power-button${props.toggleIsOnClass()}`}
          onClick={props.handlePowerButtonClick}></button>
        <span className="simon-game__settings-bottom-row-label simon-game__settings-bottom-row-label--left">On</span>
      </div>
    </div>
  );
};

const Instructions = () => (
  <div className="simon-game__instructions">Click &ldquo;ON&rdquo; and &ldquo;START&rdquo;</div>
);

const Attribution = () => (
  <div className="simon-game__attribution">
    <div className="simon-game__attribution-line">
      Simon&reg; game app created by Kevin K. from <a href="https://www.digitalmedia.nyc/" target="_blank">Vitamin Digital Media</a>
    </div>
    <div className="simon-game__attribution-line">
      <a href="http://www.orangefreesounds.com/wrong-answer-sound-effect/" target="_blank">Wrong Answer Sound Effect by Alexander</a> under <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">CC BY 4.0 License</a> (decreased volume)
    </div>
    <div className="simon-game__attribution-line">
      <a href="http://soundbible.com/1003-Ta-Da.html" target="_blank">Ta Da Sound  by Mike Koenig</a> under <a href="https://creativecommons.org/licenses/by/3.0/us/" target="_blank">CC BY 3.0 US License</a>
    </div>
  </div>
);

ReactDOM.render(
  <SimonGame />,
  document.getElementById('root')
);

              
            
!
999px

Console