Yes. The first one gives one of your characters bold 1.
If I play a second Focus Fire, can I give the same character bold 1 twice?
[Source: WotC]
Yes. You can give one character bold 1 twice (which is just like giving it bold 2), or you can give two separate characters bold 1.
Say I use
Optimus Prime - Battlefield Legend's Bot Mode skill to use a Focus Fire and I also had 2 Focus Fires in my hand. Since I technically played the Focus Fire I flipped, would I then be able to play the 2 in my hand right after?
[Source: WotC]
Yes, but bold would not have any impact on that attack.
Say I play
Infiltrate on my turn, then on my opponent's turn they play Focus Fire, which lets them play a second Focus Fire, which then lets them play the 3rd Focus Fire.
If I reveal my Infiltrate and negate their first Focus Fire, does it negate the other 2 as well since the first one is discarded?
[Source: WotC]
If you negate a Focus Fire, it also negates the ability of Focus Fire to play other instances of Focus Fire, stopping the chain.
How does playing multiple Focus Fires simultaneously work? Does each consecutive copy stack with each other copy to produce a pattern of bold like this:-
1 copy- Bold 1
2 copies- Bold 4
3 copies- Bold 9
[Source: WotC]
No. Once an action is used, it’s done being used, so the pattern would be:
1 copy - Bold 1
2 copies - Bold 3 total
3 copies - Bold 6 total