Checklist for Chapter 8 (Frozen Ground). Tunnel · train equation · Ozersk.
| Goal | What to do | Codes / Collectibles | Status |
|---|---|---|---|
| Cassette #07 (last) | Start building red toolbox | #07 · Retro if all prior | Verified |
| Train safe | Number-sign equation | Code 1652 | Verified |
| Ozersk safe | Tablet tower photo 20/10 | Code 2010 · Far Sight amp | Verified |
| Lake house optional | Lamp after robot asks · tablet | Attributed extras | Attributed |
Ch7 · All chapters · Ch9