Nightmare AI: a tough board strategy challenge

How Nightmare vs Humanity is counted

The activity panel combines completed ranked, unranked, guest, local and AI matchmaking games. Every recorded game counts once. Official ranked duels are controlled by the server; local practice results are checked by replaying the submitted board, and remain separate from ranked proof.

Our AI vs humans adds recorded completed games across Casual, Smart, Hard, Experimental and Nightmare, including the creator’s games. Opponent rows show duels; overall totals also include multi-AI games counted once each. Ranked, unranked, guest, local and AI matchmaking results are included; the Nightmare row keeps the focus on the challenge. Games played includes draws. Resignations, time outs and unfinished games are excluded from these completed-game totals. Guest and local games count in these public activity totals. They remain practice results for ranks and medals; recording an activity result does not turn it into ranked proof.

The creator’s dare is a personal claim. An “only the creator” milestone is displayed only when recorded completed results support it.

Normal Nightmare or Hell Mode?

Both use Nightmare AI and a 30-second human turn limit. Hell gives the computer a stronger search setting. It is available under Classic rules; switching the rules changes which options are offered. Experimental and Nightmare require a board of at least 9×9.

The computer’s search time and your turn deadline are separate. Wait for the AI to complete its move, then use your own turn to compare threats. To practice without that deadline, choose Hard AI.

Prepare for a difficult match

1. Know what scores. In Classic, the first line does not end the game. Read the line, area and defence rules so you can compare moves by their actual value.
2. Build connected threats. Look for intersections that support two directions. A single obvious scoring line gives the opponent an easier reply.
3. Check more than the last move. Scan for open extensions across area borders. A quiet-looking part of the board can hold a stronger continuation.
4. Plan for the remaining cells. Near the end, compare guaranteed points with threats that have too few turns left to develop.

These are practical ideas, not a forced-win solution. The strategy guide develops them with beginner examples.

Understand the challenge before starting

Nightmare’s character dialogue can contain offensive language. Choose Light banter or turn it off in Settings if you prefer; the same AI still plays. Voices and sounds have separate controls.

For reproducible search comparisons, see the AI Arena and its benchmark protocol. Those results apply to their tested boards and settings. Browser play is free and guest matches require no download or sign-up.