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Is the supply of Influence Cubes meant to be fixed at 25? If so, what do you do when all of your cubes are on the board or in your Influence Pool and you want to play a new technology?
The 25 is not a mechanical limit, so if you're out of cubes a replacement should be found to continue playing.
We did some math to figure out how many would cover the majority of games, and 25 seemed good (considering 2 are used for turn order and scoring track). It doesn't seem to come up often that there aren't enough, but it's certainly possible.