[Scoobert2000]

There's a small gap between the side of the door, apparently you can place a landmine in between there.
Video shows how to place it and what map this works on

Here are some additional spots I found, should work in TDM & FFA

[Jotaku]

That sounds like avatar PvP related.
Have you tried avatar PvP before?

I am not sure which one takes more time between getting top gears and max Lv in SAO:FB VS max Lv and unlocking all including costume in CTE.

And about landmines, this strategy should work in hero PvP as well.

[Scoobert2000]

That sounds like avatar PvP related.
Have you tried avatar PvP before?

I am not sure which one takes more time between getting top gears and max Lv in SAO:FB VS max Lv and unlocking all including costume in CTE.

And about landmines, this strategy should work in hero PvP as well.

I haven't tried Avatar PvP, just hero pvp.

[Scoobert2000]

That sounds like avatar PvP related.
Have you tried avatar PvP before?

I am not sure which one takes more time between getting top gears and max Lv in SAO:FB VS max Lv and unlocking all including costume in CTE.

And about landmines, this strategy should work in hero PvP as well.

Been wondering about a dumb strategy i did when I played with fredomn: "Set and forget"

Basically just place a mine where you think players might go to later on, make sure it out of sight as well. And keep playing normally. But I doubt this would actually work and plus you can only set one land mine down of the same version.

Also found another area for land mines in Team Death Match 4 (not sure which map it would be in FFA)
I'll upload a video on here tomorrow at some point. But I will try to explain.

On the top floor (near the ceiling) there is a door that's locked and requires you to activate it by using your grapple hook. However if you grapple on the wall and try to reach the ledge on the outside area you should be able to get up there while the door is still locked. Land mines will still go off if they walk up to the door the only problem is that it may not be effective. 

[Scoobert2000]

Added 2 more videos, not sure if this will actually work in PvP