--- key: mechanic/boss-fight-atlas--boss-real-time-progression type: mechanic id: boss-fight-atlas--boss-real-time-progression lang: en title: Real-time progression summary: Real time elapsed outside combat changes the next encounter state. updatedAt: '2026-10-22' status: active url: >- https://gamemechanics.pro/en/knowledge/mechanic/boss-fight-atlas--boss-real-time-progression/ jsonUrl: >- https://gamemechanics.pro/api/v1/knowledge/en/mechanic/boss-fight-atlas--boss-real-time-progression.json markdownUrl: >- https://gamemechanics.pro/content/knowledge/en/mechanic/boss-fight-atlas--boss-real-time-progression.md aliases: [] tags: - Boss fights - 'States, resources, and scaling' sourceIds: - source-7d83128f3e6e0372 - source-cdfd4fc5a3119a74 - source-cc9db24e2cb1bb7d - source-14c072cab555bfb7 - source-65f97d0bcdf8d0fb - source-44406c91eca38bdf - source-52b6abefac19a75a - source-225cffe186bd520c - source-c151324fe6097460 - source-57fb13e479633197 sources: - id: source-7d83128f3e6e0372 title: 'Boss Fight Atlas: Real-time progression (RU)' url: >- https://polyakovin.github.io/boss-fight-atlas/ru/mechanics/real-time-progression/ verifiedAt: null - id: source-cdfd4fc5a3119a74 title: 'Boss Fight Atlas: Real-time progression (EN)' url: >- https://polyakovin.github.io/boss-fight-atlas/en/mechanics/real-time-progression/ verifiedAt: null - id: source-cc9db24e2cb1bb7d title: 'The End · Metal Gear Solid 3: Snake Eater' url: 'https://www.youtube.com/watch?v=wy2cwRK_yQU&t=1s' verifiedAt: null - id: source-14c072cab555bfb7 title: So Sorry · Undertale url: 'https://www.youtube.com/watch?v=Icv2VlyJUio&t=1s' verifiedAt: null - id: source-65f97d0bcdf8d0fb title: Tequatl the Sunless · Guild Wars 2 url: 'https://www.youtube.com/watch?v=DWBHmeAJhT0&t=12s' verifiedAt: null - id: source-44406c91eca38bdf title: >- Metal Gear Solid Delta still lets you wait for The End to die of old age — PC Gamer url: >- https://www.pcgamer.com/games/action/metal-gear-solid-delta-still-lets-you-wait-two-weeks-for-a-boss-to-die-of-old-age-or-mess-with-your-system-clock-to-cheat-him-out-of-his-final-fight/ verifiedAt: null - id: source-52b6abefac19a75a title: Art Club room — The Undertale Wiki url: 'https://undertale.wiki/w/Art_Club_Room' verifiedAt: null - id: source-225cffe186bd520c title: 'The Megaserver System: World Bosses and Events — GuildWars2.com' url: >- https://www.guildwars2.com/en-gb/news/the-megaserver-system-world-bosses-and-events/ verifiedAt: null - id: source-c151324fe6097460 title: 'Boss Up: Boss Battle Design' url: 'https://media.gdcvault.com/gdc2018/presentations/Keren_Itay_BossUp.pdf' verifiedAt: null - id: source-57fb13e479633197 title: 'Metal Gear Solid 3: Snake Eater' url: 'https://www.youtube.com/watch?v=wy2cwRK_yQU&t=49s' verifiedAt: null relations: [] placements: - catalogId: boss-fight-atlas id: boss-real-time-progression title: Boss fights url: >- https://gamemechanics.pro/en/mechanics/boss-fight-atlas/#boss-real-time-progression categoryIds: - catalog-part-12 supersededBy: [] attributes: preview: updatedAt: '2026-10-22' title: Real-time progression description: Real time elapsed outside combat changes the next encounter state. image: src: images/mechanics/boss-final-wy2cwrk-yqu-49.webp width: 640 height: 360 game: 'Metal Gear Solid 3: Snake Eater' sourceUrl: 'https://www.youtube.com/watch?v=wy2cwRK_yQU&t=49s' originalUrl: 'https://www.youtube.com/watch?v=wy2cwRK_yQU' sourceFrameSeconds: 49 credit: Konami; gameplay capture by Nismo420R rights: >- Game graphics © Konami. Gameplay recording by Nismo420R. Original visible source markings retained. All rights reserved; excluded from portal MIT and CC BY 4.0. caption: 'Metal Gear Solid 3: The End died of old age after a long absence' alt: 'Metal Gear Solid 3: The End died of old age after a long absence' markers: - x: 37 'y': 49 label: A long gap between saving and returning changes the encounter tips: - >- Define a predictable time rule and account for returning after a long absence. examples: - title: 'Metal Gear Solid 3: Snake Eater' url: 'https://www.youtube.com/watch?v=wy2cwRK_yQU&t=49s' endsAt: null provenance: >- Editorial reference index based on the 124 public Boss Fight Atlas mechanic pages checked on 2026-10-20. Original concise RU/EN definitions by gamemechanics.pro; source categories, game/boss associations and reference URLs retained from the atlas. Linked materials retain their original rights; references are upstream attributions, not independent verification. license: CC-BY-4.0 codeLicense: MIT attribution: gamemechanics.pro contributors catalogKey: catalog/boss-fight-atlas --- # Real-time progression id: boss-fight-atlas--boss-real-time-progression type: mechanic key: mechanic/boss-fight-atlas--boss-real-time-progression lang: en status: active url: https://gamemechanics.pro/en/knowledge/mechanic/boss-fight-atlas--boss-real-time-progression/ Real time elapsed outside combat changes the next encounter state. ## At a glance ![Metal Gear Solid 3: The End died of old age after a long absence](https://gamemechanics.pro/images/mechanics/boss-final-wy2cwrk-yqu-49.webp) [Metal Gear Solid 3: Snake Eater](https://www.youtube.com/watch?v=wy2cwRK_yQU&t=49s) · Game graphics © Konami. Gameplay recording by Nismo420R. Original visible source markings retained. All rights reserved; excluded from portal MIT and CC BY 4.0. [Source recording](https://www.youtube.com/watch?v=wy2cwRK_yQU), 49 s 1. A long gap between saving and returning changes the encounter - Define a predictable time rule and account for returning after a long absence. - [Metal Gear Solid 3: Snake Eater](https://www.youtube.com/watch?v=wy2cwRK_yQU&t=49s) ## How it works Real time elapsed outside combat changes the next encounter state. ## Variants ### How the technique works - Real time elapsed outside combat changes the next encounter state. ## Context and limits A concise reference to all 124 Boss Fight Atlas mechanics across its 14 source sections. Each entry includes a definition, full RU/EN lesson links, game references and further reading retained from the source. Animations and detailed rules remain in the atlas. ## Connected materials ## Sources and provenance Editorial reference index based on the 124 public Boss Fight Atlas mechanic pages checked on 2026-10-20. Original concise RU/EN definitions by gamemechanics.pro; source categories, game/boss associations and reference URLs retained from the atlas. Linked materials retain their original rights; references are upstream attributions, not independent verification. - [Boss Fight Atlas: Real-time progression (RU)](https://polyakovin.github.io/boss-fight-atlas/ru/mechanics/real-time-progression/) (id: source-7d83128f3e6e0372) - [Boss Fight Atlas: Real-time progression (EN)](https://polyakovin.github.io/boss-fight-atlas/en/mechanics/real-time-progression/) (id: source-cdfd4fc5a3119a74) - [The End · Metal Gear Solid 3: Snake Eater](https://www.youtube.com/watch?v=wy2cwRK_yQU&t=1s) (id: source-cc9db24e2cb1bb7d) - [So Sorry · Undertale](https://www.youtube.com/watch?v=Icv2VlyJUio&t=1s) (id: source-14c072cab555bfb7) - [Tequatl the Sunless · Guild Wars 2](https://www.youtube.com/watch?v=DWBHmeAJhT0&t=12s) (id: source-65f97d0bcdf8d0fb) - [Metal Gear Solid Delta still lets you wait for The End to die of old age — PC Gamer](https://www.pcgamer.com/games/action/metal-gear-solid-delta-still-lets-you-wait-two-weeks-for-a-boss-to-die-of-old-age-or-mess-with-your-system-clock-to-cheat-him-out-of-his-final-fight/) (id: source-44406c91eca38bdf) - [Art Club room — The Undertale Wiki](https://undertale.wiki/w/Art_Club_Room) (id: source-52b6abefac19a75a) - [The Megaserver System: World Bosses and Events — GuildWars2.com](https://www.guildwars2.com/en-gb/news/the-megaserver-system-world-bosses-and-events/) (id: source-225cffe186bd520c) - [Boss Up: Boss Battle Design](https://media.gdcvault.com/gdc2018/presentations/Keren_Itay_BossUp.pdf) (id: source-c151324fe6097460) - [Metal Gear Solid 3: Snake Eater](https://www.youtube.com/watch?v=wy2cwRK_yQU&t=49s) (id: source-57fb13e479633197) CC-BY-4.0 · gamemechanics.pro contributors