I'm asking the great Gamer's Plane hivemind for advice :D
I have a F2F-TTRPG group. While my players are all great in general they are a bit unreliable. Just today I had to call off our session because two players had no time and one drank too much yesterday.
So I'm looking for a TTRPG system which I can use for the days where not enough players show up. It should match the following criteria:
-Rather lightweight on the rules system so that I can quickly explain it to whoever comes to the sessions
-Somewhat scalable so that I can play it with 2-4 player whose attendance will vary
-Light on preparation. I want to be able to set up the game in a few hours time
-Preferably free or low cost
-I personally really like science fiction settings so maybe the system has a sci-fy setting or is adaptable to one. But it's not a must-have.
I've heard that the Traveller RPG is quite nice but I don't know if it fits these criteria.
Any help will be greatly appreciated.