Ch.3 · ≈ 2 hours
Foundry Core — Walkthrough
Linear chapter with a 3-puzzle gate before the boss. Don't skip the puzzles — they cap Monolith's HP.
Objectives in order
- Solve all three lunar puzzles to vent the reactor.
- Time the magma walkway geyser cycle for 5 lunafilament.
- Defeat Cradle Mech sub-boss.
- Defeat Monolith Engine.
Tips
- Bring Stagger Cannon (or pick it up from Ch.2 Silent Array).
- On Cradle Mech, jetpack on the SECOND stomp — first is a feint.
Boss fight
The chapter ends with Monolith Engine. Weak point: Internal reactor (after 3 puzzle hacks). Drops: Lunafilament ×6, REM Data: "Origin-Δ", Engine Schematic.
Hacking puzzles in this chapter
- Puzzle 3-1 (Medium) — Stop the moving conveyor belt to access the reactor.
- Puzzle 3-2 (Hard) — Break a moving firewall ring.
- Puzzle 3-3 (Hard) — Vent the reactor before Monolith Engine triggers.