Gravity Gun • Half-Life 2
Valve’s big bullet point feature for Half-Life 2 (other than, we guess, “the sequel to your favourite single-player FPS campaign”) was physics. In 2004 it was a revelation to be able to move objects around and have those objects interact with each other in primitive but realistic ways. Much of this was due to the gravity gun - or physics gun, as it was often nicknamed. Our favourite uses of it included picking up doors or radiators to double as makeshift shields and those rotary saw blades that would decapitate the population of Ravenholm when flung with the right velocity and accuracy.