This modpack is kinda like SkyBlock except you don't start with a tree and you're surrounded by stone. It's a kitchen-sink modpack with lots of quests to help guide you at the start and to give players goals to reach.
With over 200 mods, StoneBlock is not a lightweight pack!
If you game crashes while launching and the crash log has a line like Caused by: java.lang.OutOfMemoryError: GC overhead limit exceeded
or Caused by: java.lang.OutOfMemoryError: Java heap space
, it's because the game has run out of RAM. StoneBlock needs a minimum of 4 gigabytes—but ideally 6—to run.
Go to Twitch settings and make sure the amount of RAM is at least 5 or 6 gigabytes: