Apply some houserules to make it easier to achieve goals
Mixing Fluxx sets works great for the most part and can be a lot of fun. The biggest issue is that it's harder to get the combination of keepers in order to achieve a single goal. Therefore, our group plays by the following rules:
- Starting hand is 3 + the number of additional sets.
- The number of goals allowed in play are 1 + the number of additional sets. "Double Agenda" and similar cards that allow two goals are treated as "+1 Goal Limit" cards. If the limit is reached, adding a goal allows you to replace any goal.*
- Sometimes, there are unexpected interactions between sets. Players may agree by majority vote that a card from one set counts as a card for another one.
- For instance, the "Long Live the Captain!" (Pirate Fluxx) New Rule gives +1 Draw if "The Captain's Hat" is on the table. We decided by majority vote that if "The Captain" (Star Fluxx) is out, it is considered a substitute and is treated as if it were "The Captain's Hat". This does not count towards Goal cards though, and if both are out, the substitute no longer counts.
- Similarly, the "Armada" Goal (Pirate Fluxx) requires you to have three ships out. We decided by majority vote that the "Starship" (Star Fluxx) may be considered one of the three ships.
- If a ruling seems broken, a majority vote can undo the new rule as well.
In general, we haven't had problems with mixing sets under these rules. Regarding the concern about some sets having Keepers with special powers, we found that in general they were targets for stealing, while players tended to quietly win with Keepers without powers.
Also, all decks aside from Fluxx 1.0 and Stoner Fluxx 1.0 have the same card backs, so there shouldn't be any issue with compatibility (Stoner Fluxx 2.0 has the regular Fluxx card backs).
* We tried only allowing one goal per set to be out at a time, and a new goal must replace an existing goal from the same set if one is out. However, we found this didn't quite work out because sometimes you really wanted to eliminate a particular goal, but were forced to eliminate another. Another rule that allows for diversity of goals without restricting players may be desirable.