It can be played in any NL poker game...
It is All in or fold....Limping is allowed in your blinds...You will win more money playing BOOM then any straight up form of poker...
There are also many spin offs of BOOM:
Positional BOOM - All in from the button
Every 5th hand BOOM - Going all in every 5th hand(can be substituted for ANY # of your choice)
Defend your blind BOOM - If someone raises your blind...ALL IN!
Yoshi BOOM - All in on any 2 shitty cards
UTG BOOM - All in from UTG
AND MANY MORE!
A boom is also only done correctly if the table is aware of the boom, before you actually go all in...
You: "Anyone have the time?"
Some guy at your table: "12:15 sir"
You: "WRONG! ITS BOOOOM TIME!!!!"
At this point you push all in....In this example your actually performing a UTG Yoshi BOOM...You will win playing this from of BOOM Poker