The Planet Explorers multiplayer code has been deleted and the developers will be releasing the game for free next week as they are unlikely to fix it.
Source: N4G PC Planet Explorers Multiplayer Code Accidentally Deleted, Devs Making Game Free
The Planet Explorers multiplayer code has been deleted and the developers will be releasing the game for free next week as they are unlikely to fix it.
Source: N4G PC Planet Explorers Multiplayer Code Accidentally Deleted, Devs Making Game Free