Major update! It _is_ a PIC or PIC-like micro. See the new post HERE.
I updated the schematic to reflect that is is, in fact, some kind of specialty IC and not a micro. I can't tell you what part it is because the markings on the top of the chip have been obliterated.
I removed their 'micro' and wired in a PIC12F1840. And - I can't get individual lights to turn on by themselves. If you look at the truth table, when you set the GPIOs to turn on one LED, you also set up for turning on up to three others. They must have a special part that disconnects the circuit path for the other LEDs so they can get only one light on at a time. Damn.
I just thought I'd throw this up here, since I have spent a few hours this afternoon reverse-engineering the design.
Only an 8-pin
Interesting that they are using only one resistor - between the VCC and the micro. I guess to limit the amount of current the total design will draw.
Here's the schematic - enjoy!