Puzzles documented: - Pool Reactor Meltdown: Two-character timed sequence with narrative urgency - Meteor Mess Arcade: Observation replay of cutscene high score - Music Room Demo Tape → Contract: Sequential meta-construction chain for Syd/Razor ending - Envelope Steam Extraction: Resource transformation puzzle with temporal separation New puzzle type created: Multi-Character Coordination (exploits party system for actions spanning separated locations) Files updated: timed-consequence.md, observation-replay.md, meta-puzzle-construction.md, README.md Walkthroughs collected: syntax2000 walkthrough + wikipedia game overview