In tekkit there is some BUDs but they only detect weired stuff like tree growth, or tnt explosion...there isn't a universal one, which could do everything
It is to simplyfy things. Some people use it as traps, some people use it for codes, and some people use it for adventure...
You mean cart type detectors from railcraft,they arent buds.
and you obviously dont understand what a bud is good for. you just quoted me (for traps) didint understand what greg said (code) and how the hell u use a bud for adventure?