ESI, or "Expert Skill Index", is a score given to players based on their accomplishments to try and offer a method to compare the skill level of different players.

See the Twin Galaxies help page on the topic:

ESI is only gained through beating others' scores on the leaderboard.

One way to think of ESI is to treat all of Twin Galaxies as one large gaming tournament, and ESI is the score you've earned through beating other players.

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