I'm going to show you 2 recent games 2-2 3-bet bluffs, and how and why they came through - you can also see the full actions in the replayer and decide whether it's worthy to do them or not!
1st hand (1.1$ deepstack):

Quiet an early 3-bet of mine from CO, but calling is not really an option I believe, many upcoming stacks capable to make a hero-shove with medio pairs, also at this micro level its easy to see family pots. So a needed isolation, and that's not the worst hand to do with, since we could have the nuts here or hit something and sell it still.
Flop is a low one, only a backdoor flushdraw. However we still have two strong overs at this point, and we did in fact raise our hand as a big pocket pair, so can't be afraid from the 1bb donk-bet open, and I reraised to 5bb which I could do with the represented hands as well. As you see no sets, not even a call, so it became an easy take down.
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2nd hand (1.1$ deepstack):

This could cause an argument, but it ended in a green light. So... Opponent opened 3bb in almost every second hand. I remember I wrote down every AXo, 66, 55, J9o stuffs so literally every single combination which seem to be playable, but in reality they are not. I had an amazing stack, both huge table-reputation, cause most of my actions were on point, and run with very great value.
He once again opened the usual 3bb, and as I was on BB and noone to came, I stood in with 3-bet to 10.5bbs. He was capable to fold his 3bb raise, but this time he went with us. Flop: KJ2.
To be honest, all of the noted hands are beaten here that he made his fishy 3bb playings, so I decided to continue with a 1/3 pot bet, since we are supposed to have all the premium combinations, but I choose a bet-sizing which can keep this person still in (I was really hoping on the opposite xd) - he ended up folding, so another donk combination on his side, while we put the biggest bluffs we could have.
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3rd hand (11$ Sunday Storm):

So what MTT is better to test the min 3-bet from BTN than Sunday Storm?!

It's definitely something that not adviced to do. However this deep you not adviced to do the min-betting from MP, and it looked already sus to me. So I decided to live with this small bet, and put a really weird continuation one. BB and MP also just called ( It's very important that MP just called cause we supposed to see a 4-bet here, and it cut the range incredibely, also not seeing BB with such a monster here).
Flop: 754 (backdoor flush and straight draw)
MP starting to show some strenght, and put a half-pot bet in. I doubt it, its probably a pair only, so just continued our weird line, and min-raised to x2.5. BB folded, MP only called and we still have the position advantage.
Turn: 7h
We are getting a bit closer to our outs. But MP fire another donk bet, only 21% of the pot. So puts himself on a Set? If FH, why this line? If flush-draws, why donk bet for the 2nd time? What exactly we can have? I found an answer for it, and went to make this person actually fold. Cause I believed his hand is only a straight draw here and nothing more. With my seizing I could already hit several things, and I'm supposed to have a healthy connection. A suprising call happened.
River: 6c
Villain donk bet for the 3rd time, and closing out the Set on his side. FH's more likely not, why not 4-bet me anytime. So the only remaining combination is the Flush, which the 2nd donk bet and huge 3-bet call may not make so much possible, at least pretty much narrowed flushes. So my intuition became here a chop or a bluff, and it turned out a bluff.
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4th hand (11$ Sunday Storm):

The UTG raise is something you supposed to take it seriously, however it was his first hand at the table, & we are on the BTN with just a great medium pair. So we made a 3-bet to 5.4bbs, something competitive, and if opp willing to 4-bet it, let's do it here and now - but no four bet happened, and we were going to the flop.
Flop: 327
Pretty nice flop for us, but with even a really stronger hand, no need to scare opp away. Made a 30+% bet and it was just called ( I supposed to raise here with two overs as well).
Turn: Ah
Now on the turn 2 flush-draws. Opponent checks again, and to overcome some 3-bets and make a late value-bet, because we are in position we are going to rip the Ace off with a solid bet. It even came through as opp folded, so no A in the hand, while we took down with second pair only.
Hope this hands are helpful, and give some ideas.
