Limited trap/mechanic system

[「OnTheCouch」]

so im making a big arena for boss fight, but apparently the new trap system didnt work. as you can see the spiky ball trap in yellow circle didnt work.
http://i.imgur.com/ReEqV4g.jpg

It seems they limited trap system. is it my fault that i had bad wiring?! or anyone had this too?!

btw sorry for my grammar.

[Tokfan]

There's a spawn limit how many spike balls that can be active at any given time;
http://terraria.gamepedia.com/Spiky_Ball_Trap

[「OnTheCouch」]

Originally posted by Tokfan:

There's a spawn limit how many spike balls that can be active at any given time;
http://terraria.gamepedia.com/Spiky_Ball_Trap

ahh i didnt know that. thanks for the information

[SMRT]

I prefer spear traps personally, you can pop an acutaor on them once and they become a background block so they don't get in the way & you can stack them on top of eachother (but it won't increase damage, just crate longer "walls" of spear. aslo, leave one block space between them to maximise damage (2 side by side make no difference, as each enemy is at least 2 blocks wide and immune to damage at the same time from 2 difference sources)

EDIT: Looks like you might have that figured out from the photo

EDIT 2: Also, Spear traps are affected by your critical strike chance