The easiest way to describe Eufloria's gameplay is to compare it to the board game Risk. Usually, your ultimate goal is to take over the entire map by capturing territories. In Eufloria, perfectly spherical asteroids serve as the coveted land resource, and you can only travel to asteroids that are more or less adjacent to your units (as least in the sense that the Earth is "adjacent" to the moon because we're talking about space). You want to create life on those asteroids by planting trees, and the primary type is the Dyson tree, which creates seedlings. For all intents and purposes, seedlings are the only unit you need to worry about in Eufloria, which is one of the biggest factors in keeping the gameplay simple. Not only are seedlings your soldiers and scouts, but they're also your resource for creating new trees on asteroids.