First off, I loved the fact that the second of these two games is based on the same short story as my own game "Es klingelt", and yet they're completely different! (Mine focuses on the first half, the phone calls, this one on the second half of the story: the delivery of the hydrogen bomb.)

I have managed to play and enjoy both games. We were three players in all, and played online, so sadly, we could not pass a box with a smartphone in it around. 

Both games are really freeform: no dice, no prompts. Everyone is supposed to come up with contributions from scratch, narrate what they like, building on others' contributions of course. One caveat: I imagine this game would be challenging for players who are new to such things. - The atmosphere is very Buzzati-esque.

I wonder if "Qualcosa è successo" would be even better if the players decided on the catastrophe about to occur right up front, before the game begins. "Let's do a revolution. We'll find out in play what kind of revolution it is." Anyway, just a thought. We did manage to pull off a weird train journey from Munich to Bremen...

I liked "All'idrogeno" even better. As the time went by, I felt pressed to come up with my one or two sentences quickly and "pass the bomb on". Also, everyone started to denigrate their neighbours from the get-go... very apt, I thought.

So in summary, my message to anyone reading is, check these two games out, play them with friends who are good at improvising stories, and I'm sure you'll be having a good time.