// HACKER NEWS — CYBERSECURITY
Show HN: Lathoa, a math app for kids where the AI is wrong on purpose
Your kid stops taking answers on trust. Errol is the math companion who's always wrong: find his bad step, explain why it breaks, earn detective rank. It's the one skill AI can't hand them.
A movie starts at 3:45 and lasts 90 minutes. When does it end?
Every challenge follows the same beat. Errol works the problem out loud, your kid watches for slip-ups, then breaks down what went wrong in their own words.
Step-by-step working, but one step is sneakily wrong.
Reads each step like a case file. No timer. No pressure.
Highlight the bad step. Confidence drops on Errol's face.
Explain what Errol got confused about, in their own words.
Errol reacts. Real solution shown side by side. Rank up.
Most learning apps reward the right answer. We reward the right question. Because your kid will hear a hundred plausible answers a day, from chatbots, classmates, and confident strangers. Spotting the broken one is the superpower.
Errors come in three tiers (Obvious, Sneaky, Expert) matched to age and skill. The sneakier the catch, the bigger the rank-up.