If you have printed the green card, inserted it into the green card socket, and the lights turn blue or green while the door stays shut, try fully closing and relaunching the game. Two players reported that restarting resolved this blockage; one specifically said the levers worked afterward. This is a player-reported workaround, not a confirmed official fix.
The report concerns the door after Dahn's Lab. It does not establish that every closed door in this area has the same cause, or that a blue or green light guarantees the entire puzzle is complete.
Match the reported door state
Before restarting, compare your situation with the reported sequence:
- The green card has already been printed.
- The card has been put into the green card socket.
- The lights have changed to blue or green.
- The door still will not open.
If you have not reached that state, the restart reports do not supply the missing printing or card-use steps. Keep the unfinished puzzle separate from a door that remains blocked after the reported interaction.
Try a full game restart
- Tell your partner that you are going to restart so both of you understand why the session is ending.
- Fully close the game. The successful report describes shutting down and launching again, rather than only waiting at the door.
- Relaunch and return to your co-op session.
- Recheck the door interaction and levers when you reach the blocked area again.
Do not assume that one more card, a different card color, or a hidden lever order is required. The available reports give no verified extra card requirement or replacement sequence. Restarting is the supported temporary action for this particular symptom, but it is not guaranteed to work in every session.
Recover a blocked checkpoint if restarting is insufficient
For a persistent progression block, the general recovery route is main menu → Change → Start New Journey, then have the host manually select your last checkpoint. Check the selected checkpoint before continuing; the important step is the host's manual selection.
This checkpoint route is general softlock recovery. It has not been separately confirmed to repair the green card door, so treat it as a fallback rather than an established door solution.
If the same state returns, record what both players see: whether the card is inserted, the light color, whether the levers respond, and whether a full restart changed anything. Those details distinguish a repeat of the reported blockage from a different incomplete step. There is no verified patch number or permanent door fix established here.