A player who wants the mechanics: how the avatar moves, how damage is counted and why a level plays the same everywhere
Here a run is taken apart in numbers: the avatar's speed and hitbox, lives, invulnerability, determinism, bots and statistics
Start with Damage and lives, then - Determinism
Every number the avatar moves with: walking, the dash, the hitbox, spawning, and how a level can scale them
What a hit does to the avatar, second by second, how lives are counted, and what a death does with checkpoints
Why a level with the same seed plays the same on every device, how randomness works and what this gives you
What a bot does when it plays a level for you, what it does not promise, what it costs, and how the two bots differ
What the game counts about your play and your authoring, how a record is chosen, where the files are and how to delete or freeze them
Command-line arguments that open a screen, a level or a run at once, and switches that change one launch of the game