Poker Rulz is not an actual poker game - it is a reference to the rules for popular "dealer's choice" poker games (the kinds of games you play with your friends and family for fun).
It seems like there is always somebody who is unsure of "what's better" so Poker Rulz includes a list of the standard poker hands and how they rank. There are also some "general guidelines" to help newer players.
The current version of Poker Rulz includes the rules for 26 different dealer's choice games including basic instruction on five-card draw, five-card stud, seven-card stud, and Texas hold 'em. The other games are essentially specialized versions of these basic poker games.
Currently included poker games are: 5-card draw, 5-card stud, 7-card stud, anaconda, auction, baseball, black maria, blind man's bluff, criss-cross wild, countdown, cowpie poker, Dr. Pepper, draft, fifty-two draw, follow the queen, hex wild, lowball, Mississippi stud, no peeky, number nine, pineapple stud, poker with joker, razz, steamboat, stud eight poker, and Texas hold em.