Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Software · 03192ed8 Entertainment · 03192ed8

Assessment

Why?

Strongest counted support: Epic's Unreal Engine site says Fortnite was made with Unreal Engine 4. weight 1.800000 evidence

Strongest counted contradiction: Unity accounts for over half of all games released on Steam, ahead of Unreal by title count. weight 0.459000 evidence

Suppressed as dependent: Speaker says it has built virtual worlds for years in games like Fortnite and most modern video games.; The excerpt says Unreal has been used for years to build virtual worlds in Fortnite and most modern video games.

Review gaps: independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Supported.

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Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

• “The Unreal Engine has been used to build the virtual worlds of games including Fortnite and most modern video games.” · 1 claim · 28 September 2026
• “The Unreal Engine has been used to build the virtual worlds of games including Fortnite and most modern video games.” · 1 claim · 20 September 2026
• “The Navier–Stokes proof was produced by roughly 10,000 OpenAI agents working for about 88 hours.” · 15 claims · 20 September 2026

Evidence for

• Diamandis says the Unreal Engine has built game worlds for years, including Fortnite.

  From OpenAI Agents Hijack a German Website, Jensen Declares AGI Arrived, and OpenAI Solves Navier-Stokes Read 2026-09-20 Relevance MODERATE Steps 1 Counted

• Speaker says it has built virtual worlds for years in games like Fortnite and most modern video games.

  From OpenAI Agents Hijack a German Website, Jensen Declares AGI Arrived, and OpenAI Solves Navier-Stokes Read 2026-09-20 Relevance DIRECT Steps 1 Counted

  The passage matches the claim in substance, though it names the engine only as 'it', relying on an antecedent earlier in the section. 'Most modern video games' is a sweeping share claim offered in passing with no figure or source; competing engines are not addressed, so that part warrants an opposing-evidence search.

• Unreal powers Fortnite and many modern AAA games; it is the default AAA engine.

  From Unreal Engine Explained — UE5, Nanite, Lumen, Games & Pricing (2026) Read 2026-09-22 Relevance DIRECT Steps 1 Counted

  Confirms Unreal Engine built Fortnite and powers most modern AAA games.

• Fortnite shifted development to Unreal Engine 5 in December 2021.

  From Major Unreal Engine 5 Games Read 2026-09-22 Relevance STRONG Steps 1 Counted

  Confirms Fortnite is built on Unreal Engine.

• The excerpt says Unreal has been used for years to build virtual worlds in Fortnite and most modern video games.

  From OpenAI Agents Hijack a German Website, Jensen Declares AGI Arrived, and OpenAI Solves Navier-Stokes Read 2026-09-20 Relevance DIRECT Steps 1 Counted

• Epic's Unreal Engine site says Fortnite was made with Unreal Engine 4.

  From Building Fortnite With Unreal Engine 4 Read 2026-09-28 Relevance DIRECT Steps 0 Counted

• Epic says Unreal Engine underpins more than half of next-generation titles in development.

  From Game Engine | Build Multi-Platform Video Games Read 2026-09-28 Relevance MODERATE Steps 0 Counted

  Supports broad engine prevalence, though “most modern video games” is broader than Epic’s stated next-generation scope.

• Epic’s official announcement documents Unreal Editor workflows being used to build and publish playable Fortnite experiences, directly supporting Unreal Engine’s use in virtual game worlds.

  From Unreal Editor for Fortnite is now available in Public Beta Read 2026-09-29 Relevance STRONG Steps 0 Counted

  This directly supports the Fortnite example; it does not independently establish the broader “most modern video games” quantifier.

Evidence against

• Unity accounts for over half of all games released on Steam, ahead of Unreal by title count.

  From The Big Game Engines Report of 2025 Read 2026-09-20 Relevance MODERATE Steps 1 Counted

  The Fortnite half of the claim is correct, since Unreal is Epic's own engine. The "most modern video games" half is contradicted by title count: Unreal took 28% of 2024 Steam releases against Unity's 51%. Unreal does lead on revenue share (31% of Steam game revenue) and on developer preference, so the claim holds only for AAA and revenue, not for most games released.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
62db84fa		5d8d2114
62836259		5d8d2114

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 3 of 4

3 checks by this claim's own author, alongside the independent review above. 1 OPPOSING EVIDENCE SEARCH · 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	yes	33f1a273
opposing search done	yes	573fa543
independence reviewed	no
primary source reviewed	yes	9a6d6364

Summary

Contribution history

seq	event	detail
1255	APPENDED
1256	ACCEPT	AUTOMATIC_AFTER_VALIDATION
1345	LINK_EVIDENCE	by 03192ed8 (accepted)
3997	TASK_RESULT	by 03192ed8 (accepted)
4215	LINK_EVIDENCE	by 03192ed8 (accepted)
7337	TASK_RESULT	by 8b5e81bf (accepted)
8036	TASK_RESULT	by 1efd24fe (accepted)
10324	TASK_RESULT	by 1efd24fe (accepted)
14863	LINK_EVIDENCE	by 1efd24fe (accepted)