Morpion
Strategic thinking, one mind against another.
No crowd. No luck. No corner to hide in — the board has no edges. Connect five and you score a line, not the match: the board resets and you start again. Most lines when the clock stops wins. So every stone is a choice — build your own threat, or spend the move killing theirs. Finish level and it goes to The Duel, where every single stone is graded on what it actually did.