Security 51 Endings — Replay Branches After Day 30

FAST ANSWER

Security 51 has branching outcomes; after the first Day 30 transition, use the Shift Map to alter and document one decision at a time.

Security 51 has multiple endings and a branching replay system. After the Day 30 transition, use the Shift Map to revisit an earlier decision and test one changed branch at a time. The official store supports the multiple-ending premise; a current full-release walkthrough verifies the post-Day-30 map and tutorial.

This page does not invent ending names or promise a complete route matrix. Public sources checked on August 22 do not independently verify every label and trigger. The useful answer is how to expose alternate outcomes without corrupting your own evidence.

What happens after Day 30

Current walkthrough evidence describes a final transition involving the elevator, a hologram conversation, and a tutorial for manipulating the branching timeline. That tutorial is the handoff from a first completed route to alternate-route investigation.

Do not immediately start a completely unrelated save. Open the Shift Map, identify an available decision node, and note the original choice before changing it. The focused Shift Map walkthrough explains the interface and branch log in more detail.

Reliable alternate-ending method

1. Record the shift and exact decision selected on the completed route.
2. Choose one earlier branch that the map allows you to alter.
3. Change only that choice.
4. Follow the new branch and note any changed rule, visitor, hacker evidence, or facility response.
5. Capture the final visible outcome in the game's own wording.
6. Compare it with the first route before editing another branch.

Changing several decisions together may reach something different, but it cannot tell you which decision caused it. A one-change comparison is slower per run and much faster for building a trustworthy endings map.

What counts as an ending here

Use the final visible outcome, achievement state, and branch-map position—not an unofficial nickname—as the record. Steam's public achievement page contains many hidden entries, so it cannot by itself prove an “all endings” checklist. It is useful for confirming that the game tracks outcome-related achievements, but hidden descriptions must remain hidden until the game or Steam reveals them legitimately.

The official listing's Choices Matter, Replay Value, and Multiple Endings tags establish product scope. They do not establish that every daily inspection changes the finale. Keep ordinary score changes separate from a decision that creates a new branch.

Before testing a branch

For the known Day 11 decision, the Bone Day answer separates medical-pass evidence from a guessed anomaly. Use the Shift Map guide to compare later branches without changing several decisions at once.

Sources

• Official Security 51 Steam listing
• Security 51 Day 25–30 walkthrough and branching transition
• Official Security 51 Steam achievements
• Official Security 51 Community hub