Openskill is a bayesian rating system designed for games with more than two players. A player's skill is represented as a normal gaussian distribution, characterized by a mean (μ) and a variance (σ²).

Ordinal rankings are given by μ-3σ, such that we can be 99.7% confident the player's ranking is at least this, which follows from the 68-95-99.7 rule.

All these games are yours except europa.
Attempt no landing there.
Play them together.
Play them in peace.