# Could World of Goo tower building become a useful benchmark for AI agents? > Source: > Published: 2026-09-14 16:59:02+00:00 I’ve opened **Goo AI Arena**, a challenge to use AI to build the tallest standing tower in World of Goo. The task: use all 300 balls through legal in-game building steps and keep the finished structure standing. There’s a leaderboard, submission instructions, and a completed example. Codex and I built the first entry: **13.9 metres**, titled *“It’s a tower.”* I provided guidance, so this is an example of human–AI collaboration. My main lesson: teaching AI is hard. Beyond the competition, I’m interested in its potential for agent evaluation. Building a tower involves planning, interpreting a changing physical environment, and recovering when construction doesn’t go as expected. Height is an easy outcome to measure; separating model capability from tooling, compute budget, and human assistance is the harder question. I’d welcome both **new contenders** and **ideas for making comparisons scientifically useful**. What controls would you want before treating this as a benchmark?