The rules:

* Goal: be the last fighter alive.

* Turns: each round every fighter takes one turn. Turn order is randomized every round.

* Actions: Move one cell up/down/left/right, attack an adjacent enemy for 15–24 damage, or wait. An action consumes 1 AP.

* Rocks/Obstacles: 4 random impassable cells.

* Power-ups: Gold +1 AP per turn.

* Kills: the killer gets +1 AP per turn, and heals 50 HP (no over-heal).

(Unclear while watching replays, found in README.)