Arduino Whack-a-Mole Game (4 LEDs + 4 Buttons + TM1637 Display)

Hit it the moment it lights up! The arcade classic **whack-a-mole** on your desk: one of **4 LEDs** lights up at random, and if you press the **button** of the same colour before it goes out, you score. Every 5 hits is a new level and the moles stay up for less time. A wrong button costs 1 point and 3 seconds. Time and score show on the **TM1637**, the record lives in **EEPROM**, and a **passive buzzer** gives each hole its own sound.