Pluginy AMX Mod X

Spawn with a knife and a Deagle holding a single bullet; a kill refunds a bullet, a knife kill grants one, and a miss leaves you with the knife.

Only headshots kill: body hits are cancelled (with an optional clink) and head hits are guaranteed lethal, with an optional pistols-only buy.

Shotgun-only rounds with an XM1014 or M3 (cvar), unlimited ammo, blocked buying, instant respawn and an optional knockback punch on every hit.

Knife-only rounds: strips weapons, blocks buying, tunes speed and gravity.

Freeze-tag mode: a lethal hit freezes the victim as a glowing ice statue instead of killing; a nearby teammate thaws them, and a team wins by freezing every opponent.