"if bada was an npc that was brought into the game to help solve the puzzles by Doha"
- it could be because Bada inserted a tape. But remember that SC is also in on this (making Bada play) and his tape was only removed until Doha accidently inserted a tape out of curiosity
"if that’s the case then how do we know that ALL the players AREN’T just npcs that got brought into the game at different points?"
- this is why I always say in the comments take the revelation about Bada being an Npc as a grain of salt bc atp no one knows anything about the game + who the people really are. All they know about is, or at least they think, is that they have to play and complete the game to get out of the game. In short, they're all unreliable because they're all just figuring things out together.

if bada was an npc that was brought into the game to help solve the puzzles by doha, how was he able to keep being a character and continue playing when doha’s tape was ejected and doha was an npc? wouldn’t doha or someone have to bring him along every time since bada as an npc only shows up when the others are nearing the bridge??? was the story before the tunnel just omitted, and the game would just start from when they’re in the tunnel, meaning there’s no explanation needed for why bada is there? did the storyline change after bada started his tape? if that’s the case then how do we know that ALL the players AREN’T just npcs that got brought into the game at different points? since the gameplay effectively changes anytime someone else is added to accommodate their presence as a
player. & as npcs the other players don’t notice if someone new is in the group (since bada joining them didn’t tip anyone off) idk this is kinda confusing but still really good