Copy and Paste the code into a new Arduino sketch.
It is based on the DuinoTag Instructable here.
It uses pins:
2 for IR receive sensor input,
3 for IR LED sender output,
4 for the trigger button input,
12 for a buzzer output – to make simple beep noises
13 for an LED to show activity
Should be enough to get something working.
Then modify the code to use a sound module/amplifier/1000W subwoofer, add game modes, scoring etc..