Opus 5.5 rebuilds Terraria in 3D in eight days with 346K lines of C#

A creator says they wrote no code themselves, using Opus 5.5 to build a 3D Terraria on a custom engine in eight days, with 3,369 items and 313 enemies and bosses.

Edgex

@SahilExecArchived 2026.10.07Originally posted 2026.10.06

Edgex @SahilExecOriginally posted 2026.10.06

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Claude Opus 5.5 basically rebuilt Terraria in 3D. 8 days. 346K lines of C#. 3,369 items. 313 enemies & bosses. Custom engine. No Unity. No Godot. And the wildest part? The creator says they wrote none of the code. AI game development is getting absurd.

x.com/sahilexec/status/2107444680732668320Archived 2026.10.07 10:13

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