Show HN: Arbitale – emergent choose your own adventure game https://ift.tt/Y3R5KGX

Show HN: Arbitale – emergent choose your own adventure game Hi everyone! I am building Arbitale and it is currently in pre-alpha. I'm looking for play-testers who can give feedback on the product. The goal is to eventually have different characters in the game be their own agents, with emergent narratives that are totally unique to each playthrough. Each agent acts according to its own pre-written incentives. Would love to hear what you think! https://ift.tt/8FjTDQY September 3, 2026 at 12:12AM

Show HN: SufferTrails, the Anti-AllTrails https://ift.tt/ArtsGgO

Show HN: SufferTrails, the Anti-AllTrails Don't get me wrong. I love a good family-friendly hike as much as anyone else. But sometimes you want to be grimacing, not smiling, on the trail. SufferTrails is that, and not much else. All trails not allowed. https://ift.tt/Uyhe2Em September 2, 2026 at 11:27PM

Show HN: AQ – A multiplayer workspace for coding agents on your own cloud https://ift.tt/mbFW5tC

Show HN: AQ – A multiplayer workspace for coding agents on your own cloud https://aq.dev/ September 2, 2026 at 11:16PM

Show HN: Newton's Orchard – Browser-based space/gravity playground https://ift.tt/mlkdS1M

Show HN: Newton's Orchard – Browser-based space/gravity playground Hi HN! My son spent a lot of time in 5th grade playing with the 2-dimensional PhET gravity/space sims[1]. His STEM class uses it, and he was playing with it at home, and has been looking for more. I found several space sims/playgrounds online, including NASA's Eyes on the Solar System[2], but nothing that seemed to offer a real progression from what he was getting out of the PhET sims, so I built Newton's Orchard over the summer for him. https://ift.tt/g0LIwiT The source is also published at https://ift.tt/SiPt07a It features deterministic time scrubbing, all bodies are editable, different preset systems and experiments, missions to complete (complete 3 to unlock the blackhole object type and mission), and a gallery for user submissions. I would very much appreciate feedback from HN - particularly from the lens of making it engaging and illuminating for students, and anyone that would like to just get a feel for how gravity works. Thank you! [1] https://ift.tt/WSpqDP2... [2] https://ift.tt/I4lrZqR https://ift.tt/g0LIwiT September 1, 2026 at 10:13PM

Show HN: Mcptunnels – ngrok for MCP with basic OAuth https://ift.tt/JC37OTS

Show HN: Mcptunnels – ngrok for MCP with basic OAuth Basically, OpenAI tunneling sucks and is broken most of the time. This can get you tunneling pretty trivially to share with someone temporarily. Roadmap includes being able to host MCP servers trivially as well. https://terragohan.github.io/mcptunnels/ September 2, 2026 at 02:04AM

Show HN: Semantic Overlays – an NX bit for LLM prompt injection (live demo) https://ift.tt/t6O27pu

Show HN: Semantic Overlays – an NX bit for LLM prompt injection (live demo) I've built a new method for steering LLMs called Semantic Overlays, small trained adapters on a frozen model which change how it perceives a piece of its context. The most readily applicable usage is to mitigate prompt injection, and it lets us take a very-injectable Qwen-3.5-9B to SOTA scores on all the prompt injection benchmarks I could find. (They are only blackbox attacks, but I did NOT train on anything like them — whitebox attacks are out of scope for this paper) I'm excited for you to play with the tech — see if YOU can break it! (let me know if you can) Paper at https://ift.tt/BAFRDpZ if you want to read more about it, code at https://ift.tt/EWKauSN , adapters at https://ift.tt/3zNdyMC... Also https://ift.tt/jKtpiJI if you wanna watch a little video I made! https://semantic-overlays.vercel.app/ September 1, 2026 at 11:10PM

Show HN: Guess the AI model from its web design https://ift.tt/cQp81Lx

Show HN: Guess the AI model from its web design https://ift.tt/rSuHnR3 September 1, 2026 at 01:10AM