Piezo Pulse Tap

A ring of piezo discs around a single lamp. Tap a disc and it dumps a packet of charge into the shared capacitor; how brightly the lamp burns depends entirely on how much is left in the bank, and the charge leaks away the whole time. Each disc also needs a beat to recover before it will fire again. Your job is to keep the glow sitting inside the target band for as long as the level asks. Tap too fast and the filament runs past the redline and burns out; stop and the glow drops out of the band and the hold timer starts over. Later levels slow the discs down, speed the leak up and squeeze the band, so the rhythm has to get tighter and tighter.