Fist of Guthix is a mini game avaliable to Free Game players that consists of one player getting "Charges" with a two-handed stone, and another hunting him/her down before they get too many charges. Then the places switch.
The role of the Hunter is simple: Kill the Hunted before they get too many charges. They can achieve this by using melee, range or mage attacks. Magic is used most commonly in this game as the players get free runes on entry.
The role of the Hunted is less simple. They have to avoid the hunter while weilding the stone to get charges, however they can hide in one of four houses which can teleport them around with out the hunter seeing. The closer the Hunted gets to the Fist of Guthix in the centre of the arena, the weaker they become.