# Checkpoint

- **Event:** [Gemini 3 Hackathon London](https://cerebralvalley.ai/e/gemini-3-hackathon-london)
- **When:** Sat, Dec 13 at 9:00 AM – 10:00 PM (UTC)
- **Where:** CodeNode, London, UK
- **Team:** [Dongting Qin](https://cerebralvalley.ai/u/dongting)
- **GitHub:** https://github.com/qyd0801/Checkpoint
- **Demo video:** https://youtu.be/Ch5GCHtD5zI
- **Gallery:** https://cerebralvalley.ai/e/gemini-3-hackathon-london/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/gemini-3-hackathon-london/hackathon/gallery/36

We've all been there: lying in bed at night, eyes closed, but unable to sleep because our brains are replaying past mistakes—moments where we failed to fight back against verbal attacks, wishing for a chance to go back and fix it.

Checkpoint was created to realize this fantasy. By simply telling your story to Gemini 3, our prototype uses Nano Banana to instantly generate a personalized 8-bit game scene and dialogue. It allows you to travel back to that specific moment, re-experience the conflict, and simulate different endings.

Underlying this simple interaction is the principle of CBT (Cognitive Behavioral Therapy), specifically 'Imagery Rescripting.' By actively choosing new, healthier responses in a safe simulation, users can break the cycle of regret and gain closure."

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