Seed Lab Walkthrough

Seed Lab lets players combine individual features from Terraria's special seeds. Its title-screen panel configures new world generation; its in-world panel controls supported singleplayer runtime effects.

Feature catalog

Features are grouped by seed and category so broad choices can expand into the exact underlying flags and patches. Presets store selected combinations. Runtime and world-generation selections use separate files so preparing a world does not silently change the current play session.

World generation

Seed Lab applies requested flags before Terraria's generation passes and resets them at the correct boundaries. Zenith is a combined seed, so its component effects remain active across every relevant pass instead of being restored after only the first pass.

World-generation state and presets use safe replacement writes. A failed or interrupted write leaves the previous valid file available.

Runtime patches

Supported singleplayer features cover enemy scaling and behavior, spawns, lighting, death sounds, holidays, hunger/darkness, recall, respawn, vampire cleanup, and seed-specific rules. Disabling a feature or leaving a world clears its temporary state.

Multiplayer

Runtime overrides remain inactive in multiplayer. Seed Lab is intended for singleplayer gameplay and local world creation.

Source

See src/SeedLab/ in the TerrariaModder repository.