RNG

Computers cannot roll real dice, so games use a random number generator – a piece of code that produces unpredictable-looking numbers – to decide chance-based outcomes. Will this attack land as a critical hit? Will that monster drop a rare sword? Which cards will you draw? All of these come from the RNG.

Players have turned the abbreviation into everyday slang for luck itself. “Good RNG” means things went your way; “bad RNG” means they did not. People say a game is “RNG-heavy” when chance plays a big role in results.

Where randomness appears

Common places include item drops, critical hits, card shuffles, map layouts built through procedural generation, and the contents of randomised rewards. Designers use randomness to keep games surprising and replayable. Too much, though, and skill matters less; too little, and every match feels the same. Getting that balance right is a large part of game design.

Some games use “weighted” or “protected” randomness, quietly improving your odds after repeated bad luck so you are not stuck forever. Others publish exact drop rates so players know what to expect.

Speedrunners and RNG manipulation

In older games especially, the random numbers can be predictable if you know how they are produced. Some speedrunners learn to perform specific actions to influence results, a practice called RNG manipulation.

Why it matters for money

RNG becomes important for families when randomness is attached to spending. Loot boxes and gacha pulls let players pay for a random chance at an item. From June 2026, PEGI rates newly submitted games with paid random items at PEGI 16 by default, which reflects how seriously this is now taken. Checking whether a game sells random rewards, and using spending controls, is a sensible step.