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Here's Gem Island with one change:

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a stone ledge, two metres high,

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with the third gem on top.

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Can the player get it?

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Let's ask Claude Code to find out.

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Open the GameStudio menu,

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and choose Open in Claude Code.

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Claude Code starts in a terminal,

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in your project folder.

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Click Done.

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In the terminal, ask in plain words:

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can the player collect every gem?

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Fix anything that's wrong.

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Claude Code connects to Blender

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and reads the level first:

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where the player starts,

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where the gems are, and the new ledge.

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Then it playtests.

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GameStudio plays the game in a hidden

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browser with scripted keys, and sends back

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screenshots, the game's state and its logs.

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Two gems out of three.

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The third gem was never picked up:

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it's two metres up,

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and the player's jump peaks under one metre.

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So Claude adds stairs.

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The stairs appear in Blender, up against the ledge.

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It gives them a mesh Collider,

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shaped like the steps, so the player can walk up them.

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Then it runs the very same playtest again.

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This time the player climbs the stairs and

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takes all three gems, and the win screen opens.

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Claude saves the level, and tells you what was wrong,

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what it changed, and the proof:

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the playtest that now passes.

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That's the loop:

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ask Claude Code to playtest, let it fix what fails,

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and check that the same test passes.