Show HN: Lathoa, a math app for kids where the AI is wrong on purpose

Lathoa is a math app for kids aged 10-14 that features a robot named Errol, who solves math problems step by step, but with one intentionally incorrect step for the user to identify. The app evaluates user explanations and awards points for speed and accuracy. The developer notes that it's challenging to get a Large Language Model (LLM) to produce incorrect answers, and a second model is used to cross-check the work. However, the second model can also make mistakes, and a plain arithmetic check is used to verify the math. The app currently only supports English cases, with other languages presenting parsing issues. The developer is seeking feedback on whether learning from someone else's mistakes is as effective as solving problems independently.