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Once Human: A Family Legacy Walkthrough

Start A Family Legacy by investigating Mae’s diary in Evergreen, Red Sands. Solve the cube puzzle for the Rosetta Researcher’s Map, then follow it to the Alternate Reality Research Institute and search the lab for the safe.
Length2 min Posted Quest giverVGSources Team
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To start the A Family Legacy quest in Once Human, investigate Mae’s diary in her house in Evergreen, Red Sands. Solve the cube puzzle to obtain the Rosetta Researcher’s Map, then follow it to the Alternate Reality Research Institute and search the lab for the Rosetta safe. The institute can be more dangerous than the quest’s listed level suggests, so prepare for stronger enemies.

How to start A Family Legacy

  1. Travel to Evergreen in Red Sands and find Mae’s house. Guides place it near (4490, -2272) or (4490, -2269), but use the in-game marker and location rather than relying on an exact coordinate.
  2. Enter the house and investigate Mae’s diary. This starts the quest. The map may call the activity “Legacy Left Behind,” while the HUD may display “A Family Legacy.”

Solve the cube puzzle and get the map

Arrange the blocks as U6D, then open the chest that appears to collect the Rosetta Researcher’s Map. This is the best-supported answer among the reviewed guides, but their instructions conflict: one reports U-6-P, and another says the note may show U9D.

If U6D does not advance the objective, reread the in-game clue and use the quest’s feedback to check the displayed characters. Treat the guide answers as reported solutions rather than a guaranteed current-game observation.

Find the Rosetta safe

  1. Use the Rosetta Researcher’s Map to travel to the Alternate Reality Research Institute in Red Sands.
  2. Follow the in-game marker and map through the multi-floor facility to the laboratory.
  3. Search the lab and loot the safe. One guide gives a treasure location near (6929, -1673); use the in-game directions through the building rather than relying on that coordinate alone.

Recommended level and preparation

Do not assume the destination is low risk because the quest is listed at level 32. Guides describe the institute’s enemies as much tougher, with a recommended region level near 48 and enemies around level 49. These are guide-reported values and may vary, so bring equipment and supplies suited to a challenging facility.

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Reported quest rewards

Game8’s 2024 guide lists these rewards. They are reported guide values, not independently confirmed live-game data.

Reward Reported amount
Energy Link 1,800
EXP 4,800
Stellar Planula 15
Eclipse Cortex One level 3

FAQ

Where do you start A Family Legacy in Once Human?

Investigate Mae’s diary inside her house in Evergreen, Red Sands.

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What is the A Family Legacy cube puzzle answer?

U6D is the best-supported answer among the reviewed guides. If it does not work, reread the in-game clue: guides disagree, with one reporting U-6-P and another describing a U9D clue.

Where is the Rosetta safe?

The Rosetta Researcher’s Map points to the Alternate Reality Research Institute in Red Sands. Follow the marker through the facility to the laboratory and search for the safe.

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Is the institute difficult for a level 32 quest?

It may be. Guides report stronger enemies and a recommended region level near 48, so prepare for more danger than the quest level alone suggests.

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