From ColorPlanet
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For every 10 missions you complete, you gain a level.

The highest leveled players can be seen in a Scoring table

For every level gained, your worker/portal placement range increases by 15 meters. At level 0 the range is 500 meters.

At level 6 you receive your first module and you can build the Collector map building.

At level 7 you unlock the Cooperative Collector map building.