Ask for the shape of the challenge.

Every wall, floor and ceiling is destructible and every one of seventy-odd operators changes what a room means, so the hardest part is a memory problem rather than an aiming one.

Twenty-five years of accumulated convention, none of it in the game — spray patterns, utility line-ups and default positions are all things you are assumed to already know.

Counter-Strike’s stand-still-to-shoot rule with abilities layered on top, so a duel can be lost to a wall you did not know that agent could place.

A MOBA played from behind the character, so half your abilities have to be aimed and the other half have to be aimed while something is aiming at you.

The movement is the skill ceiling and nothing in the game mentions it — the players beating you are using techniques that were never taught, only tolerated.

Pace notes, no rewind on the harder settings, and a damage model that ends a rally on one bad corner. The hardest driving in the catalogue by a distance.

A hundred and seventy champions, each with four abilities you are expected to know the cooldowns of, and the tutorial covers none of it.

Slow, heavy and unforgiving — one bullet from someone you never saw ends thirty minutes, and the correct play is usually to not take the fight.

Every hero is free and every one of them can do something no other game would let a hero do, which is why the learning curve is measured in years rather than hours.

Building is a second game bolted to the first, played at a speed that looks like a bug, and the mode that removes it is where most people should start.