Add the following to the end of the rule “Fun and Games”:

Name: Pogs
Rules: When this Activity has 4 Members, it is Ongoing. Each Member of this Activity may choose to bet any amount of Energy that is equal to or lower than their current amount of Energy. Within 24 hours of the Activity becoming Ongoing, they must post a Response to the Activity post, where [Response] is a SHA-1 hash whose contents start with the amount of Energy spent as a bet. After this Response has been posted, the bet cannot be changed. Every hash must include a salt which consists of the word ‘salt:’ followed by any number of characters; all text including and following the word ‘salt’ is considered to have no effect on the contents of the hash. When all Members of this Activity have posted a Response, they must then post a Response within 24 hours where [Response] is the contents of the hash they responded with previously to this Activity post. When all Members of this Activity have posted said Response, the Activity is Over. When the Activity is Over, the Member of this Activity that bet the highest amount of Energy in this Activity is the Winner of this Activity. When this Activity is Over, every Member of this Activity must spend the amount of Energy they bet. When 2 or more Members are tied for the highest bet, this Activity has no Winner. When a Member fails to respond with their hash or the contents of their hash within the allotted time, then their bet is considered to be 0 and they are considered to have posted a Response.
Location: Garden
Cost: 1
Reward: 100

In the rule “Party Time”, directly after “A Partygoer that joins or is the Captain of an Activity is considered to be a Member of that Activity.”, add:

While an Activity is Open, all of its Members must abide by the Rules of its Game. When an Activity is Ongoing or Over, only Responses in the format “Move: [Response]” can be Responded with to it.