I run Claude Code in a side panel most of the day and kept tab-switching to Twitter every time a longer task was running, which meant I'd miss the moment it actually finished and come back ten minutes late. Dropped a Tetris ROM into Standboy and now the Game Boy just sits there doing its thing in the sidebar - I glance at it instead of alt-tabbing away completely, so I actually notice when it goes idle again. Setup was genuinely a folder drop, no config file to fight with.