colour version
to whoever wants to delve into the workings, the logic should be semi-easy followable except for why I've used NOR gates at the cathode of the LEDs instead of connecting them direct to the 'NOT Q' of the JK flipflops. there's a little quirk I noticed that the NOT Q doesn't drop to 0 as quick as it rises, using NOR gates to the flipflop Q is more immediate and creates a better illusion of balls falling
previous iterations:
https://everycircuit.com/circuit/5543782166298624
https://everycircuit.com/circuit/4935926769516544
https://everycircuit.com/circuit/5147579754741760
