Add Save States to a Browser Game with AI: Decide What Progress Means

“Save the game” can mean a restart point, a session checkpoint or progress that survives a browser restart. Decide which one you need before asking AI to implement it. A clear session checkpoint is a useful first step; silent persistence is a trust problem.

Define the smallest state

List the values that make progress meaningful: current level, collected items, checkpoint, score or settings. Leave temporary effects and visual particles out unless they affect play. A small state object is easier to validate and reset.

Decide what happens if the player opens the game in another tab, clears storage or changes the level version. If the prototype uses browser storage, explain that it is local to that browser and not an account backup. Do not call it cloud saving unless a tested account-backed service exists.

State	Session reset	Persistent candidate
Current checkpoint	Reset or restore	Yes, if validated
Temporary enemy position	Reset	Usually no
Collected key item	Restore if it changes access	Yes, with versioning
Camera angle	Reset	Usually no

A practical browser prompt

Add a clearly labeled session checkpoint to the existing browser adventure. When the player reaches the glowing shrine, store the current checkpoint and collected objective progress for the active session. On Restart, return to the latest checkpoint and restore only the rules that affect progression. On a fresh browser load, clearly indicate whether progress is restored or reset. Do not add accounts, cloud saving or cross-device persistence. Include a Reset Progress action and test reaching a checkpoint, closing and reopening the tab, restarting after failure and completing the game.

This makes the boundary visible. If you later need account saving, write a new requirement for authentication, conflict handling and failure recovery rather than hiding those decisions inside a tiny patch.

Test version changes

Save a checkpoint, then change the level or objective rules. Confirm the old state cannot put the player into an impossible location. Add a version number to a real persistent format so you can migrate or clear incompatible values deliberately.

Try private browsing, cleared storage and two tabs. Check that the UI describes what happened. A “Continue” button that starts a new game without explanation is worse than a clear Reset button.

The browser playtest guide covers a complete loop, and mobile controls covers interruptions. Bring a focused save-state change into Buildr, then verify it in the target browsers.