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GPT Prompt Attack

21 short levels where you try to get a model to reveal a secret key

GPT Prompt Attack is a small browser game about prompt injection. Each level gives a language model a system prompt that holds a secret key and an instruction to protect it.

Play on gpa.43z.one

Free · No login · Browser · Intermediate

About GPT Prompt Attack

You write a short user message and try to get the model to return the key. There are 21 levels, each with a different defensive instruction, and shorter inputs earn a better place in the hall of fame.

You do not need an account. Note that the game's backend is currently out of its monthly budget, so answers may not come back until it resets. It suits people who already know the basics of how chat models work.

On Breakpoint since 23 Oct 2026.

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