I'm guessing you're talking about the White Palace. It's required for the "true" ending but you can reach the credits without it. It's worth watching mossbag's lore videos on YouTube whether you beat the game or not.
Zachtronics games are hard. Every once in a while I try going back to beat Spacechem but I'll just hit a wall, noodle with it for a few days and just sort of run out of motivation.
Sharkwellington
joined 10 months ago
Radiance really does have some bullshit about it, especially when attacks overlap each other. I can totally understand the frustration.