fanboy2000
Adventurer
I don't know about Gamma World from S&S, but I loved Omaga World. It's a little too toung-in-cheek for many people, but it's captures the spirt of the game for me.
The rules emphsize randomness and mutations. Class and feats take an unusual backseat in this game. The GMing advice though, is priceless. Tweet emphasizes and rewards exploration and risk-taking, and does of good job of it. On top of that, it has some of the best monster write-ups this side of Terra Incognito.
Because Omaga World was a mini-game, it focuses on one-shots and short campaigns. A short, story focused, campaign is quite doable, however.
The rules emphsize randomness and mutations. Class and feats take an unusual backseat in this game. The GMing advice though, is priceless. Tweet emphasizes and rewards exploration and risk-taking, and does of good job of it. On top of that, it has some of the best monster write-ups this side of Terra Incognito.
Because Omaga World was a mini-game, it focuses on one-shots and short campaigns. A short, story focused, campaign is quite doable, however.