I beleive red arrows can mean that combos can be collected at that shot.

Not sure what the fuel lights are for, they may represent Burnt Pistons but I'm not sure.

The red spider arrows indicate the next possible "combo" shot for you to hit depending on the first shot you make.

Ex: If you hit the right ramp, the spider in front of the left ramp, as well as the left orbit will light, allowing you to combo either of those two shots together. If you make the next combo shot the red spider will move and show you the next combo option, and so on.....

Does that make sense?

The red spider is also used to select/collect the CIU hurry ups or something like that. Someone who knows more than I should be able to explain that for you.

this is the best rule sheet that exist for the game

http://www.pinballrevolution.com/threads/metallica-pro.3077/

indeed, great link!
Was very helpfull

This may help...

great doc! Is there one for premium I wonder???

Premium is the same rules. Only difference really is physical ball lock, and the spinners count towards some of your points/modes.

Also the spider inserts are more clear since the color changing helps indicate their function. Red for combos, blue for seek and destroy locking, pink for lady justice etc.

I still don't understand the hurry ups, how to get one started, and how you need to complete them in order to get to Seek & Destroy? Can you complete them individually or do they all need to be collected at once?

Shoot one of the shots to select it as indicated by the arrow lighting (red on pro, blue on le). While that lane is lit, hit sparky, snake, cross. The lane will now be flashing. Shoot the lane again. The coffin is flashing. Hit captive ball to complete the lane. At any time shooting another lane selects the new lane instead. Lock all lanes to start seek and destroy.

Working towards crank it up is done by collecting sparkys, snakes, coffins, and crosses. You get one point towards each of these any time you hit that feature or anytime you shoot a lane with the feature lit. For example, shot at the left orbit, once completed, awards a sparky, cross, and snake towards crank it up in that one shot. Since starting seek and destroy clears the lanes, one strategy is to milk the competed lanes towards crank it up. Another strategy is to light a couple lanes then farm them during multiball so that crank it up is lit after exiting the mb.

Complete 4 crank it ups and qualify it a 5th time to enter End of the line wizard mode.

Thanks for the explanation. Much harder to do while playing. Practice.

Nice explanation markmon. I remember being confused by that when I first got my game, once you grasp how it works you'll just start implementing it as part of your shot strategy.

Yeah thanks Markmon for explaining!!

It means shoot the fu€¥!/ red arrow because there's good shit to be collected.... Hope this helps.

Thats my strategy, I like to keep it simple! hah