What makes a game skill-based?

Randomness is not the same as unfairness

A dice roll is random. A game where one player rolls dice and the other does not is unfair. Those are different properties, and conflating them is why so many arguments about luck in games go nowhere.

What makes randomness acceptable in a competitive game is symmetry: the same random input applies to both seats, or the random outcomes are equally likely for both, and the match is won by what players do with what they are given. When that holds, randomness adds variance without deciding who is better over time.

The three questions that settle it

For any game, ask these in order. The answers tell you where your practice time should go.

• Is the random input symmetric? In Keno, both seats receive the same draw, so the only difference between players is what they do with it. In Mines Duel, each seat gets its own board and the mine positions never match, but both boards are the same size, hold the same number of mines and use the same value table — so the scoring opportunity is equivalent even though the boards differ.
• How much of the outcome does a decision move? In Barricade every barricade and both pawns are public, so nothing is hidden behind a draw — the result is almost entirely the decisions you and your opponent make. Compare that with Keno above, where the draw sets the ceiling and your choices only decide what you do with it.
• Can a better player win more often over many matches? This is the practical test. Per-game Elo ratings exist precisely to answer it: results across a series reveal who is better, even when a single match goes the other way.

Perfect-information duels versus managed chance

At one end sit games like Chess, Tic-Tac-Toe, Four-in-a-Row and Dots & Boxes: nothing is hidden and nothing is drawn, so the outcome is a pure function of planning and reading the opponent. At the other end sit games built around a random input you manage rather than control.

Most of GRYND's catalogue sits in between, and the useful thing to notice is which side your game leans toward. In a perfect-information duel, the way to improve is study and pattern recognition. In a chance-managed game, the way to improve is pricing risk — knowing when a gamble is worth taking and when it is simply a losing bet.

What GRYND does about the fair-play half

Skill-based claims are only meaningful if the random parts are genuinely random and the rules are enforced equally. That is a platform question rather than a design one: randomness is generated server-side, game logic is server-authoritative, and per-game ratings keep results honest over time. The Fair Play Policy documents those commitments, and it is a more useful read than any claim about a game's percentages.

The practical takeaway: stop asking whether a game is 'skill' or 'luck'. Ask which decisions the game lets you make, and whether both players get the same set of them. That question has a useful answer, and the first one does not.