"Forward replay" was actually the mechanism that Tabletop Simulator originally used for its undo system. After around 30 minutes of playing games in the simula

"Forward replay" was actually the mechanism that Tabletop Simulator originally used for its undo system. After around 30 minutes of playing games in the simulator, pressing "Undo" would hang the client and likely disconnect most people connected to the server. It's not a great way to implement undo.