StarForge includes four default gamemodes, two of which are not currently available. Some modes are only available in either Singleplayer or Multiplayer.
| Name | Emblem | Brief Description | Singleplayer | Multiplayer |
|---|---|---|---|---|
| Creative | 
|
In this gamemode, you are free to build without the looming threat of the Leeches. | Yes | Yes |
| Fort Defense | 
|
This gamemode consists of you defending your Respawn Vat from the hostile Leech. Random weapon boxes and resources will spawn a distance away from the Vat. The mode starts with a 2 minute and 30 seconds, this is that time before the fist wave arrives. The wave ends when the last Leech is killed, starting a 30 second timer. This is when the next wave launches. | Yes | Yes |
| Fort Wars | 
|
In this gamemode, you defend your Respawn Vat from the opposing team, while at the same time trying to destroy their Vat.
This game mode has yet to be released. |
No | Yes |
| Survival | 
|
in this gamemode you survive as long as possible by killing enimies, collecting resources and building home/fortress/THE MOST EPIC MANSION EVAR!!! | Yes | Yes |