Security 51 Complete Walkthrough: Days 1–30

Daily walkthrough index

Use the day pages for a focused shift checklist, then return here for the broader systems and story context.

Security 51 progression map

There are 30 days in the initial Security 51 progression before the post-ending branching stage. The Shift Map then lets you revisit earlier decision points, so “30 days” does not mean the game is finished after one linear run.

Why This Security 51 Walkthrough Matters

Stepping into the role of an Area 51 security officer is no cakewalk. Between verifying clearances, scanning staff for anomalies, and deciding who gets elevator access, the pressure mounts quickly—and the deeper you descend, the less certain you become that anyone standing before you is still human. This Security 51 walkthrough is built to help you navigate every shift with confidence, avoid common pitfalls that trigger game-ending failures, and uncover the branching paths that lead to multiple endings. Whether you're stuck on Day 4's infamous camera puzzle or struggling to understand order priority, this Security 51 walkthrough breaks down each mechanic with actionable strategies gathered from community reports and player experience.

Understanding Core Mechanics and Daily Operations

Security 51 borrows heavily from the document-checking formula popularized by Papers, Please and Contraband Police, but introduces its own layered systems that can trip up even seasoned players. At its core, each in-game day presents you with a series of visitors approaching your desk. Your job is to inspect their documents, run diagnostic tools, and determine whether they should proceed through the elevator, be handed over to security, or be sent to isolation.

Key Inspection Tools

The Day One update, rolled out on August 13, added several quality-of-life improvements that directly impact how smoothly these tools function. Notably, you can now skip the spec-ops team Extermination and Isolation animations in the elevator, which saves significant time during repeat attempts. The update also improved text colors for anomaly displays and added color highlights to the Manual sections, making it easier to parse complex rules at a glance.

Mastering the Daily Orders Priority System

The single most common source of frustration—and the reason many early negative reviews appeared on Steam—stems from misunderstanding how daily orders interact with one another. Based on player experience shared in the community hub, here's the critical rule: later orders take precedence over earlier ones when they conflict.

How Order Priority Works

Consider this real example from a community report:

In this scenario, a visitor with a skin rash should be allowed through, not detained, because the third order supersedes the second. Many players mistakenly apply only the most recent order they remember, or worse, apply all orders simultaneously without recognizing the hierarchy.

Temperature Orders: Read Carefully

Another frequent stumbling block involves body temperature directives. One player admitted they misread "HYPERthermic" and "HYPOthermic" as the same condition, sending everyone to security until they realized the distinction.

• HYPERthermic = high body temperature → typically flag for security
• HYPOthermic = low body temperature → typically allow passage (depending on the specific order)

The game provides a detailed failure breakdown when you mess up, listing every reason you failed the day. Use this feedback constructively rather than dismissing it as a bug.

Anomaly Detection: Camera Challenges and Hidden Clues

Several days in Security 51 require you to use a camera to detect anomalies that aren't immediately visible. The most notorious of these is Day 4, which has generated numerous community discussions about both the anomaly known as "The Jester" and difficulties with camera controls.

Camera Tips from Community Reports

• Scan the entire area, not just the person's face. Static effects and visual glitches can appear anywhere in front of you—on the wall, the floor, or beside the visitor.
• Point the camera at the static effect location. It doesn't need to be aimed directly at the person. If you see distortion in the environment, that's your target.
• To put the camera away, some players report that standard clicking doesn't always register. Try right-clicking or pressing the interaction key again to toggle it off.
• Marking photos as anomalies can sometimes feel unresponsive. If you cannot mark a photo during Day 4's Jester challenge, ensure you've captured the correct area of distortion first.

Known Anomaly Types

For the camera-specific anomaly workflow, see the dedicated The Jester anomaly guide. For the Day 10 photo investigation, use the Day 10 walkthrough alongside the Phantom Hound guide.

Day 15–24 late-game walkthrough checklist

The late-game shifts add more simultaneous responsibilities. Use this section as a safe route through the full Day 15–24 range while checking each shift's current Manual. The exact anomaly targets, order priority, and available tools are build-sensitive, so this guide does not invent a universal answer for every visitor.

External walkthroughs currently document Level 2 as Day 15-24 and Level 3 as Day 25-30, with randomized visitors and repeatable daily rules. Use the tables below as route notes, then verify the exact visitor against your in-game Manual.

Before each shift

1. Read every order and note which instruction has priority if two rules conflict.
2. Check which tools are available today: documents, camera, thermal scan, MRI, fingerprints, or blood testing.
3. Review the Anomaly Database and open the relevant tool guide before the first visitor.
4. Leave room in the Isolation Ward if today's instructions require containment or research.

During the shift

• Complete the document and clearance checks before escalating to a specialist tool.
• When a rule names an anomaly, use the corresponding evidence source instead of guessing from appearance.
• Record the reason for every deny, security call, or isolation decision so that a later failure report is actionable.
• Recheck the order after a new tool or story event changes the active instructions.

After each shift

• Read the failure breakdown if the shift ends unexpectedly; it often identifies the missed rule.
• Complete available isolation or research actions before advancing when the current route depends on them.
• Link the result back to the Choices and Consequences guide and the Endings hub.

This Day 15–24 framework is intentionally conservative: use the in-game Manual as the source of truth for the exact daily target, then return here for the next shift's checklist.

Handling Multiple Anomalies in the Elevator

A frequently raised community question involves situations where two or more anomalous individuals are in the elevator simultaneously. When you detain one, the others may attempt to leave. Here's how to manage this:

1. Identify all anomalies before taking action. Run every available check on every person in the elevator.
2. Detain the most dangerous anomaly first if your orders specify a priority.
3. Use the isolation ward strategically—the Day One update added explanatory notes to this screen to clarify its function.
4. If others escape, restart the day. The game allows mid-day restarts, and shifts are relatively short, so the penalty is manageable.

Navigating Endings and the Shift Map

Security 51 features branching paths with multiple endings. After the initial Day 1-30 progression, the Shift Map becomes the safer way to test alternate routes from a completed save.

What we can say safely

For route planning, use the Endings hub and change one branch decision at a time.

Common Pitfalls and How to Avoid Them

• Don't skip reading the Manual. The Day One update added color highlights specifically because players were missing critical rule details.
• Restart freely. Unlike Beholder, where a mistake can cost you fifteen minutes, Security 51's shifts are short and restartable at any time.
• Read every word of every order. "Hyperthermic" and "hypothermic" are not the same thing. Neither are "skin anomaly" and "skin rash."
• Check the full scene with the camera. Don't tunnel-vision on faces.
• Report bugs through official channels. The developers are actively monitoring both the Steam Community Hub and the Alawar Discord, and have already pushed fixes based on player feedback.

FAQ

How many days are in Security 51? The initial progression runs through Day 30. After reaching the first ending, the Shift Map lets you branch from earlier days and pursue different crisis outcomes, endings, and achievements.

What should I do after Day 30? Open the Shift Map guide and choose a day marked with a question mark, border, or branch tooltip. Change one major decision and play forward far enough for the new consequence to appear.

Is this Security 51 walkthrough applicable after the Day One update? Yes. All strategies here account for the August 13 update, including the ability to skip elevator animations and the improved Manual readability features.

What do I do if I'm stuck on Day 4 and can't find The Jester anomaly? Based on community reports, The Jester appears as a static distortion effect in the environment, not necessarily on the person. Scan the entire visible area with your camera, look for visual glitching, and aim at that location. If you still can't mark the photo, try restarting the day—some players have reported intermittent issues with the marking interaction.

Does Security 51 have a hard mode or endless mode? Yes. The August 27, 2026 Steam update added Endless Mode and Easy, Medium, and Hard difficulty settings. Existing saves remain on Medium, so start a new game if you want to choose a different difficulty.