Since they've remade the official forum, so I can't find about the old guide about combo attack.
So can we make a dicussion to get clear information, then I can write a new guide ?

This is my information.
To combo-attack , it requires :

► Find the average level of team : M (who's going to attack the target)
► Level of the target : N
► M - N must be greater than 25
► Follow the "chaining speed" or "speed chain"

I did these thing, but I didn't do the combo-attack. I really don't know why in my case.

char a - level 68rb - speed : 346
char b - level 109rb - speed : 321
pet a - level 70 - speed : 270
pet b - level 80rb - speed : 380

target - level 100 - speed (as my calculation) : 288

M = 157.5
N = 100
M - N > 25 (done)

speed chain works (done)

The average speed is 329. It is also greater than the target's speed (288) .

But my team can't combo. Please explain me.
P/s : Hmm.. I think all speed in team must be greater the target's speed. But pet a is not (270<288).
I wonder if it was the reason.

Team A:
Player 1:150
Player 2:200
Player 3:250
Player 4:300
=full team combo
speed must be different by 50 at max
this was way back when I was playing so idk how it is now..
and why ask so many random stuff... useless knowledge(I mean other posts not this one)

50 is safest but you can have the speeds anywhere from 1 to 99 between each other

If you're asking about level based combo it's something like all the levels combined divided by 25

Edited based on this

Aries: Klayton

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Chuckie, you're not right :) .
The speed range is 99, not 50.
Sometimes 105 still works but
The less number, the more combo chance.
99 is 100% for combo. It's called "speed chain" in some guides.

But in my case, I was right.
All speed of each attacker must be greater than speed of the target.
One of my pets has the speed less than the target's. So they can't combo.
For being sure, I tested with another monster that has less speed (200)
My slowest pet has speed 270 (>100), and my team got combo.

The new thing's for you. :)