By far the single most common and popular form of gambling in Colonial society.
55 Hexagonal cards (3 suits: purple, green, orange; with purple ranking the highest and orange the lowest.)
Capstone card: Highest card in a Third level Pyramid. And can also be used as a wild card
Each suit contains:
3 First level cards
6 Second level cards
9 Third level cards
It is played kind of like Poker, where the players can discard once and then have to bet on whatever they wind up with.
Six cards are dealt and a player can discard up to four cards per hand (like Draw Poker). Then of course, you place your bets based on your hand, etc. and go from there. It sounds like it is very similar to Poker, just with different cards. (Thanks very much to the Battlestar Pegasus site for info on Pyramid.)