Before is a tool for replaying archived Blaseball data developed by the Society for Internet Blaseball Research. It works by setting a browser cookie with a time offset. It serves your browser a (mostly) unmodified copy of the Blaseball frontend application from that time, then serves that application archived data by emulating the application backend.
There are many imperfections to this system: there are data gaps in SIBR’s archives; and data for certain objects is sometimes not granular enough. This is most notably seen when a player is affected by a game event; clicking on the player will not show the change until usually about a minute later. (Incinerations and Feedback swaps prior to Season 5 are also impacted by this.)
Using Before for research and videos is welcomed; please cite before.sibr.dev, and don’t take our archives as the only word of truth, especially in early seasons.