Star Citizen is free to play until May 27, as developer Cloud Imperium Games gives players temporary access to the game during its latest event.
The game is approaching $1 billion in player funding.
That would make it one of the most funded video game projects ever.
Star Citizen has been in development for more than 10 years and still has no full release date.
The single-player mode, Squadron 42, is currently expected to launch in 2026.