If you provide some more detail about how the scoring needs to work then I'd be happy to whip something up for you. Just yesterday I finished a system with 9 scoreboards, which had to be only 3 active at a time and remembered your best score from previous sessions.
Turning logic on and off via a keyframe should be simple; I'd recommend using the keyframe to turn off a microchip.
Yes turning the thing on and off is the easy part :p That would be great thx!
So, the details.
The game has picks up that change every 3 seconds. (I did a video back then)
So it's done with a keyframe already.
The first step is simple. When you take many pick ups in the blue phase, it gives you more and more points, so you need to hurry and take risks to do that. The multiplier reboots when each blue phase stops.
There is a tricky second part. There is a flash at the start of the blue phase, and if you take the first pick up during those 4-5 frames, then the multiplier doesn't reboot, but goes on where it stopped at the last blue phase (so that works only for the next blue phase, not the one after that, it has to be a series)
So basically, let me try to schematize that.
[blue] 10, 20, 30, 40, 50, 60 [red] ... [blue] 10, 20, 30 etc...
[blue] 10, 20, 30, 40, 50, 60 [red] ... [blue] [flash bonus!] 70, 80, 90 etc...
It can accumulate as long as the player continues hitting the flash phase every next blue phase.
Not sure this is clear :p
Of course if you die by hitting the pick up in the red phase it stops everything.