1. Game Objective:
– Every second, one of the four colored boxes (Red, Blue, Yellow, Green) will randomly change to grey.
– Your goal is to tap on the grey box before it returns to its original color.

2. Gameplay:
– The grey box will stay grey for exactly *1 second*.
– After the grey box returns to its original color, a new random box will turn grey.
– You must tap on the grey box within that 1-second window to score points.

3. Scoring:
– Tapping the grey box while it is grey will increase your score by *+1*.
– Your current score will be displayed at the top of the screen.

4. Game Over Conditions:
– If you fail to tap the grey box within 1 second, the game is over.
– If you tap a box that is not grey (one of the colored boxes), the game is over.
– When the game is over, a pop-up will display your final score with the option to restart the game from a score of 0.

5. Restarting:
– After a “Game Over,” you can tap the “Restart” button to play again and start with a score of 0.

Remember: The key to the game is to always tap the grey box before it changes back, and avoid tapping the colored boxes!