The ramps and orbits are flashing white.

Shoot any shot to turn them orange for 5 seconds.

Shoot any shot again before 5 seconds is up to score a Kung-Fu Combo for 2,000,000 points; the shots stay orange and it also resets the 5-second timer, so keep shooting!

Shots reset to white when you go 5 seconds without collecting a combo.

Grace period: entering a shot when it is orange will add 2 seconds to the combo timer.