Circuit with a single buzzer but multiple L.E.D and switches
This is simply 3V batteries with LED and Current limiting switch with Diode OR logic. and a 3V Piezo Buzzer .







simulate this circuit &ndash; Schematic created using CircuitLab


If White LEDs then no 50R resistor needed, if 3V battery max.
If Red or Yellow 2~2.1V , 0.9V drop/50~18mA