Randomness is usually a choice
Chance in a game is rarely an accident. A designer who adds a shuffled deck, a damage range or a random map feature is typically pursuing a specific goal, and the choice has costs as well as benefits. Looking at the goals makes it easier to judge when randomness helps and when it does not.
This article concerns the reasons for including chance. How the numbers are built into a project and how they are tuned afterwards belong to other topics; the question here is simply why a designer would want an uncertain outcome at all.
Goal one: tension and suspense
If the result of an action is known in advance, the action is a chore. If it is uncertain, the moment has weight. A player rolling for a chance to succeed pays attention in a way they would not for a guaranteed outcome. The most dramatic moments in many games are those where the result hangs on a roll or a draw with a meaningful chance either way.
The effect is strongest when the stakes are visible and the odds are neither tiny nor overwhelming. Very unlikely outcomes feel like lotteries, and very likely ones carry little suspense. Designers often choose odds that leave a real possibility of both results.
Goal two: variety and replayability
A fixed game can be solved: once players learn the best sequence, it repeats. Randomness changes the situation each time. Shuffled decks, randomised starting positions and generated levels all make sure that no two sessions play out identically, which keeps the game fresh and forces players to adapt rather than recite.
This goal is served best by random elements that change the decisions available, not merely the numbers. A random enemy damage value adds little; a random set of options that forces a new plan adds a lot.
Goal three: accessibility and comebacks
Chance compresses the gap between strong and weak players. In a game of pure skill, a newcomer facing an expert loses almost every time and may stop playing. A game with a meaningful random element gives the weaker side a chance, which keeps matches between mixed groups enjoyable. This is also one reason family games commonly include dice.
Similarly, chance can create comebacks. A game where a leader is always safe tends to be decided early; a random swing can reopen the contest. Designers sometimes pair this with explicit catch-up systems, but randomness is the simplest tool.
The trade-off is that the same compression may frustrate serious players who want their decisions to determine results. The mix of luck and skill in a game is a design position, and different audiences prefer different points along it. How much of any result belongs to which is a question for the luck and skill discussion elsewhere on the site.
Goal four: expressing uncertainty in the fiction
Some games use chance because the situation they simulate is uncertain. A critical hit, a missed shot or an unpredictable weather change represents something real about the setting. The fiction becomes more convincing when not every action succeeds automatically. Hidden information serves a related purpose by making the opponent’s intentions uncertain, and a fair amount of strategy comes from handling that uncertainty.
Goal five: giving decisions something to work with
Counter-intuitively, randomness can increase the role of skill. When the situation is uncertain, good players distinguish themselves by managing risk: choosing safer or riskier lines, preparing for bad outcomes, and playing around likelihoods. Decisions such as whether to keep an opening hand in a card game depend on weighing the chances of future draws. Mulligan decisions are a clear example of a skill that exists only because of randomness.
Where chance goes wrong
Randomness is not free, and poorly placed chance undermines the goals above.
- Too much, too early. If a single early roll decides the whole game, players feel their later choices were pointless.
- No agency. If players cannot influence odds, prepare for bad outcomes or recover from them, a loss feels like bad luck rather than a mistake to learn from.
- Hidden or unclear odds. Players are more tolerant of randomness when they understand it. Unexplained results feel arbitrary.
- Swinginess in competitive play. Where results are meant to measure skill, large random swings reduce how reliably they do. There are limits to how much randomness a serious competitive format can absorb before results stop meaning much, a point explored under the limits of chance.
- Streaks. Real random sequences produce clusters that players read as patterns or unfairness. Designers sometimes smooth these with adjusted probabilities, which changes the feel without changing the stated average much.
Choosing when to add chance
A practical way for a designer to decide is to ask what the random element is for. If the answer is tension, then the stakes need to be visible. If it is variety, then the randomness should change decisions. If it is accessibility, then the weaker player should have a realistic path. If the answer is only that it adds some variety, the feature may be better without it.
Random event odds should also be understandable. A player who can estimate the chance of success can plan around it, and the planning is part of the fun. Randomness that supports decisions tends to be welcomed; randomness that replaces them tends to be resented, and most of the craft lies in telling the two apart.