This is a 2-person game.

Let $\ P\ $ be any arbitrary projective space (of any dimension $\ \ge2$ and any cardinality, etc., but typically, let it be a finite plane over a field). Let $\ S_0\subseteq P\ $ be an arbitrary **finite** set (typically, $\ S_0=P\ $ or $\ S_0=P\setminus L\ $ or
$\ S_0=P\setminus(L\cup Ł)\ $ where $\ L\ $ and $\ Ł\ $ are straight lines, and $\ P\ $ is a finite projective plane -- all three of these cases are mathematically equivalent).

The positions of the game are subsets $\ S_n\ $ of $\ S_0\ $ such
that there exists straight line $\ L_n\ $ such that

 $$\ S_n\ := S_{n-1}\setminus L_n $$
and
   $$ S_{n-1}\cap L_n\ \ge 3. $$

The winner (of the *positive* flavored game) is the player of the last legal move.

One may also consider the negative flavor when the last legal move causes a game loss.

**Question**  As a minimum, one would like to decide about the winning strategies for the projective planes over fields
$\ \mathbb Z/7\ $ and $\ \mathbb Z/11,\ $ where $\ S_0:=P\ $ is the respective projective plane.

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*Some years ago, I wrote a program in Perl that solved the
positive flavor for the projective plane $\ P\ $ over
$\ \mathbb Z/5\ $, for arbitrary $\ S_0\subseteq P. $ I should be able to find that program (I hope) -- with my today's computer, possibly it should handle $\ \mathbb Z/7\ $ (or only after some improvements? -- hmm, I have a much more powerful computer these days than in the past but my ability went down the drain hence it is a tie).*