There is no time limit and no end mission here, and the difficulty continues to rise as the days go by. How long can you survive?

Endless is an advanced game mode. It is the same as Expert, except the campaign setting for Campaign Length is set to “Endless”. This has the following effects:

• The intro cinematic is skipped.
• Central's dialogue is different. She explains that Invisible is at the brink of bankruptcy and tasks you with refilling the agency's coffers. This has no gameplay implications.
• Buying from Monst3r is possible before the first mission. He does not talk about lore.
• Incognita's voice does not degrade over time.
• The map screen does not display the remaining hours.
• Mission Difficulty can go up to 10.
• Archdaemons start appearing at day 4. The map screen also turns red and yellow to signify this.
• All exits become Security Exits starting at day 5.

If Contingency Plan is active, there are two additional campaign settings.

• Mission Difficulty can go up to 20.
• Chiton is permanently active starting on day 10, and upgraded by an additional Armor level on days 14 and 18.
• Watchdog is permanently active starting on day 12, and upgraded by an additional KO Resistance on days 16 and 20.
• Enforcers use XL-5 Scan Grenades starting day 13. The scan disables Hologram Projectors, Prism's Holo Projection Mesh, and all forms of Invisibility.

• The Research Facility appears on day 4. It behaves as normal, with all the same consequences.
• Archdaemons don't appear before day 5.
• Security Exits don't appear before day 7.

There are several achievements associated with Endless mode. For each, a certain day must be reached. The achievement is awarded on the map screen, at the same moment as the new day is announced and new missions appear.

• Rebuilding the Firm: 5 Days
• Corporate Ladder: 10 Days
• Empire Builder: 21 Days (with Contingency Plan; the check is coded differently and requires the 20th day to be completed)