P1: A/D turn, hold W to move.
P2: ←/→ turn, hold ↑ to move.
• Goal: Score more points than your opponent.
• Leaf item: +1 point and snake grows.
• Boost item: No growth, but temporarily faster.
• Collision: Dead snake loses 1 point; both snakes respawn.
• Leaving an edge teleports you to the opposite side.
Space: Pause/Resume, Enter: restart round (during match).