Homeworlds is one of the best and most interesting games written for the Looney Pyramids. However, the fairly cramped nature of the galaxy makes multiplayer games a bit difficult.
These are some rules for how to expand the game to run across two parallel universes, one of matter and one of antimatter.
In the normal, matter universe, the colours for each of the technologies are as normal.
In the alternate antimatter universe, the xeno colours are used, with the following meanings:
Three ancient warp gates exist, binding the two universes together. One lies in each arm of the galaxy.
Warp gates are marked by special stars, using black and white. The white warp gates are present in the xeno universe, the black warp gates in the rainbow one.
There is one warp gate of each size in each universe. They are not removed if no ships are at the warp gate.
A player with a ship at a warp gate can invoke the power of the gate to transport her ship into the other universe. The ship is removed from the table, and replaced with an identical ship of the corresponding colour for the other universe. If this is not possible, the ship may not be transported.
Gameplay is otherwise the same, but with the aforementioned warp gates the world opens out a bit, with slightly more options and space. This variant is thus recommended for four or more players.
This is still something of a proto-ruleset. Some alternatives I'm considering:
Stargates
Instead of being fixed, ancient warp-gates, stargates are like any other star. They can be part of the home-star of a player, and can be built as usual. When a stargate is used, it acts like a yellow star, moving one ship to a new or existing stargate of the other polarity, and colourchanging it.
Warp Drives
As stargates. However, ships can also be black or white.
Antimatter
Warping a ship to the other universe doesn't necessarily change it. If it's antimattered, then it will annihilate in some certain circumstance, probably as if a catastrophe.
Things which I haven't yet thought about much:
Sacrificing
Should it be possible to sacrifice a ship in the xeno universe and take that action in the rainbow one?
Size gaps
What happens when a ship attempts to warp from one universe to the other, and the requisite size/colour is not available?
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