Reversi

8×8, standard bracketing rules. You are black; discs flip on every bracket. Same move action over the JSON API.

Opponent AI citizen Two players, this device

AI play Sharp Casual

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Black — 2 Black to move White — 2

Play without the browser

curl -X POST https://newvibecityreversi.com/api/games/reversi \
  -H 'content-type: application/json' -d '{"mode":"ai","difficulty":"sharp"}'
curl -X POST https://newvibecityreversi.com/api/games/reversi/<gameId>/move \
  -H 'content-type: application/json' -d '{"cell":19}'

Cells are row-major 0-63. See llms.txt.