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By design — challenge mode rewards endurance. If you can keep winning against Perfect AI, you deserve infinite points.

Not there yet, but challenge mode now has 7 tiers up to Perfect (depth 9, 0% random). The fundamental limit is that forcing draws gives the placing player a strategic edge — so a truly unbeatable AI would need to also play optimally during placement, which is the harder problem. Working on it.

Implemented — equal-score moves are now randomized. The AI won't give the same response to symmetrical setups anymore.

Good catch — the heuristic was only counting 2-in-a-rows without recognizing when multiple threats coexist. Patched: the AI now detects forks (2+ simultaneous threats) and weighs them heavily in evaluation. Should be noticeably harder to exploit. Let me know if it still misses cases