- Primary Mission: Follow this step-by-step The Alters Last Variable walkthrough to survive the 20-hour campaign.
- Key Mechanic: Balance the 14-day Cryosleep Chamber deadline in Cycle 1 while expanding your underground base.
- Best Strategy: Prioritize creating Jan Geologist first to secure a stable Metal economy before investing in advanced tech.
- Critical Tip: Always reserve 50 Organics per person before entering cryosleep to prevent a catastrophic game over.
- Top Choice: Use the final autosave before the final JanBot conversation to experience both story endings.
DLC Access and Campaign Prerequisites
The Last Variable expansion, released on July 13, 2026, functions as a paid story expansion rather than a standalone game. It requires ownership of the base game, The Alters. This campaign continues the specific narrative branch where Jan Scientist remains on the planet to investigate the Oasis while the other clones depart.
| Platform | Release Date | Price (USD) | Base Game Required | Key Features |
|---|---|---|---|---|
| Steam | July 13, 2026 | $14.99 | Yes | Steam Achievements, Cloud Saves |
| Epic Games | July 13, 2026 | $14.99 | Yes | Single-player campaign |
| GOG | July 13, 2026 | $14.99 | Yes | DRM-free offline installer |
| PlayStation 5 | July 13, 2026 | $14.99 | Yes | DualSense vibration support |
| **Xbox Series X | S** | July 13, 2026 | $14.99 | Yes |
To access the new campaign, launch the main game, navigate to Start New Game, and select Last Variable. The expansion runs on an independent save progression system. Your previous base-game buildings, inventories, and research choices do not carry over into this new story.
The expansion's narrative heavily spoils the late-game revelations of the base campaign. Completing Jan's original journey first is highly recommended to understand the emotional stakes, clone relationships, and JanBot's role.
The Alters Last Variable Walkthrough: Cycle-by-Cycle Guide
Surviving the harsh planetary shifts requires strict adherence to daily schedules. This step-by-step The Alters Last Variable walkthrough guides you through the critical objectives of each planetary cycle.
Cycle 1: The First Branch
Your journey begins with the quest Famous Last Words. Locate and speak with the Old Scientist to fulfill his final request, then bury him. Return to JanBot and inspect the damaged Research Lab. You must research the New Branching Procedure (costs 20 Rapidium, takes 2 working hours) and build your first Metals Outpost to the south. You have a strict 14-day deadline to build the Cryosleep Chamber (costs 50 Metals, 65 Rapidium) under the quest Forced Dormancy. Collect three Oasis samples to construct the Sample Analysis Module (costs 60 Metals, 50 Rapidium, 60 Organics) and install your first Terraformer in Rocky Valley before entering cryosleep.
Cycle 2: Oasis 2.0
Upon waking, restore the resource outposts dismantled during the transition. Under the main quest Oasis 2.0, research Drilling Through Root Barriers to bypass planetary blockades. Explore the newly opened routes within the Oasis. Your primary structural goal is to build the first Field Laboratory (costs 50 Metals, 50 Minerals, 100 Organics) on the second tier near the Metals Outpost. Assign a specialist Alter to this outpost before the final day of the cycle.
Cycle 3: Proxilium and Misty Gorge
Speak with JanBot at the Field Laboratory to unlock Proxilium processing. Build a Proxilium Tank (costs 150 Metals, 40 Minerals) and construct the Splitter (costs 300 Metals, 150 Minerals, 100 Organics) to produce advanced materials. Research and deploy a Tier II Terraformer in Misty Gorge. Finally, upgrade your base with a Magnetometer (costs 30 Metals, 30 Minerals) to complete the 12-hour Magnetometric Analysis.
Cycle 4: Quantum Biofield
Investigate the planet's rising radiation waves. Complete the Radiation Crystallization experiment (takes 12 working hours) to unlock pathways leading to the elevated central area of Misty Gorge. Construct the second Field Laboratory here and assign an Alter to secure the research data before the cycle expires.
Advanced Cycles: Megafluid Tech
Combine data from both active Field Laboratories to unlock Megafluid production. You must construct and activate two Tier III Terraformers (costs 90 Metals, 200 Rapidium, 75 Megafluid each) in Far Hill and Waterfall. Upgrade the Sample Analysis Module with a Mass Spectrometer (costs 50 Metals, 50 Minerals) to perform the 12-hour Mass Spectrometric Analysis, then deploy the third Field Laboratory in Far Hill.
Final Cycle: Energy Extraction
Analyze the planetary core (takes 12 working hours). Build the Resistor Blocks (costs 50 Metals, 300 Phased Rapidium, 200 Proxilium, 100 Megafluid) and craft the ENC Generator Alternator (costs 50 Metals, 50 Organics, 160 Special Resources). Assemble the generator, place it in Rocky Valley, and activate it. Descend through the newly constructed base Elevator Section to reach the final chamber.
Do not leave the Oasis during Cycle 1 after collecting only one or two samples. A second trip consumes an entire block of working hours, which can ruin your early build order.
Specialist Alters and Best Assignments
Creating the right specialist clone at the correct time determines your survival efficiency. The expansion introduces four specialized versions of Jan, each possessing distinct work efficiencies and research contributions.
Jan Geologist (S-Tier)
- Creation Priority: 1st (Cycle 1)
- Work Efficiency: +50% Metal mining speed.
- Key Contribution: Accelerates Phased Rapidium and root-barrier drilling.
- Assignment: Keep him on active mining duty and anomaly exploration.
Jan Physicist (A-Tier)
- Creation Priority: 2nd (Cycle 2)
- Work Efficiency: +50% Workshop crafting & maintenance speed.
- Key Contribution: Cuts Splitter research time from 6 to 4.75 hours.
- Assignment: Assign to Workshop queues and base repairs during earthquakes.
Jan Chemist (A-Tier)
- Creation Priority: 3rd (Cycle 2/3)
- Work Efficiency: +50% refining speed; faster food cooking.
- Key Contribution: Completes Field Lab research in 6.25 hours instead of 10.
- Assignment: Station him at active Field Laboratories and chemical refineries.
Jan Biologist (A-Tier)
- Creation Priority: 4th (Cycle 3)
- Work Efficiency: +100% Greenhouse speed; 8x faster healing in Infirmary.
- Key Contribution: Speeds up Terraformer and biological sample research.
- Assignment: Keep in the Greenhouse and Infirmary to manage crew health.
| Specialist | Best Early Assignment | Personality Profile | Field Lab Assignment Timing |
|---|---|---|---|
| Geologist | Metal extraction outposts | Adventurous, bold, highly curious | Late-game, after anomaly research |
| Physicist | Workshop crafting & repairs | Self-assured, status-conscious | Mid-game, after Splitter setup |
| Chemist | Chemical refining & cooking | Pragmatic, precise, factual | Early-game, before first Field Lab |
| Biologist | Greenhouse & medical recovery | Idealistic, emotionally worn | Mid-game, during high-radiation phases |
When you assign an Alter to a Field Laboratory, they leave the base permanently for that cycle. Complete their personal conversations and base-specific tasks before sending them out.
Underground Base Layout & Cryosleep Preparation
The underground base requires careful grid planning. Unlike the base game, you must deal with soil restrictions and prepare for long-term hot phases by stockpiling resources before entering cryosleep.
| Base Module | Construction Cost | Power Load | Soil Restriction | Primary Function |
|---|---|---|---|---|
| Cryosleep Chamber | 50 Metals, 65 Rapidium | High | None | Required for cycle transitions |
| Sample Analysis Module | 60 Metals, 50 Rapidium, 60 Organics | Medium | Stable Soil | Analyzes planetary samples |
| Splitter | 300 Metals, 150 Minerals, 100 Organics | High | Deep Soil | Processes raw materials |
| Workshop | 40 Metals, 20 Rapidium | Low | None | Crafts repair kits and tools |
| Infirmary | 30 Metals, 40 Organics | Low | Stable Soil | Heals physical injuries |
The Cryosleep Checklist
Before ending any cycle, you must complete the following steps to avoid critical failures or clone deaths upon waking:
- Secure Organics: Stockpile exactly 50 Organics for each clone remaining in the base (e.g., 150 Organics for Jan plus two base-bound Alters).
- Dismantle Surface Outposts: Deconstruct temporary pipelines and outposts to recoup materials before the planetary shift destroys them.
- Heal the Crew: Ensure all clones are fully healed in the Infirmary and have low radiation exposure levels.
- Assign Field Lab Workers: Place your chosen researcher in the active Field Lab; they do not consume base Organics while stationed outside.
Failing to meet the Organics requirement before entering cryosleep will result in the permanent death of your unsupplied Alters, severely crippling your research capacity in the next cycle.
Endings, Achievements, and Missables
The expansion features two distinct endings based on your final choice with JanBot, along with seven new achievements worth 210 Gamerscore.
| Ending | Decisive Choice | Narrative Theme | Final Outcome |
|---|---|---|---|
| Create a Successor | Choose "Create a Successor" | Obsession & Continuity | A new clone is made to continue the endless Oasis research. |
| Break the Cycle | Choose "Break the Cycle" | Mortality & Acceptance | Jan refuses to burden another life, ending the research cycle. |
Campaign Achievements Checklist
Expansion Trophies & Achievements:
- Space Gardener: Place your first Terraformer on the planetary surface.
- Mastering Rapidium: Successfully initiate the production of Phased Rapidium.
- Mix and match: Successfully initiate the production of Proxylium.
- Substance Genius: Successfully initiate the production of Megafluid.
- Wait, you can do that?: Create the exact same specialist Alter for a second time.
- Caring after all: Complete all four specialist Alters' personal storylines.
- The reason I stayed: Successfully finish the Last Variable campaign.
To unlock Caring after all, you must resolve all personal story prompts (indicated by speech bubble icons over clones) before activating the ENC Generator in the final cycle. Use the final autosave to easily view both endings.
Frequently Asked Questions
Q: Do I need to finish the base game to play The Alters Last Variable walkthrough?
You do not need a completed save file to start, as the DLC runs as a separate campaign. However, completing the base game first is highly recommended for story context.
Q: What happens if I don't build the Cryosleep Chamber in 14 days?
Failing to construct the chamber within the 14-day limit in Cycle 1 results in an immediate game over, as Jan cannot survive the planet's lethal hot phase.
Q: How do I unlock the 'Wait, you can do that?' achievement?
You must create the same specialist Alter type a second time. This can be done if a clone is lost during the campaign or by using advanced cloning options late in the story.
Q: Can I bring my base-game resources into the Last Variable campaign?
No. The expansion starts you with a fresh base layout, basic starting resources, and an independent progression tree.