Portal: Prelude Test Chamber 12 (Bonus)
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This is the ninth Bonus map of the game. It is unlocked when the original Test Chamber 12 has been completed.
Test Chamber 12 (Bonus)
challenge_12.bsp 
Hazards
Strategy
Portals
- To do
Steps
- To do
Time
- To do
Award requirements
| Portals | Steps | Time | ||||||
|---|---|---|---|---|---|---|---|---|
| Bronze | Silver | Gold | Bronze | Silver | Gold | Bronze | Silver | Gold |
| 6 Portals | 5 Portals | 4 Portals | 35 Steps | 25 Steps | 15 Steps | 60 Seconds | 40 Seconds | 20 Seconds |
Video strategies
- To do