Casual is online multiplayer with no rank on the line — relaxed games against real
people (with bots filling any empty seats). Same rules as Ranked, none of the pressure.
Casual carries no ranking penalty for leaving. If you have to drop, you can — abandoning
a casual match won't ban you or cost RP. (Ranked is strict about this; see
Ranked → Penalties.)
The only casual penalties come from the anti-griefing fair-play kicks below, and even
those are light:
These run in every online game (Casual and Ranked alike) — and locally in
Single Player. They keep games moving and punish griefing.
If you stop taking actions, a "Still there?" prompt appears after about 30 seconds
idle (sooner if you've already been flagged), with a 10-second countdown. No response and
your seat is permanently converted to a bot for the rest of the match so the other
players aren't stuck waiting.
A stall is a turn that runs out the clock having conquered at most one territory.
A siege is repeated full rounds with no real engagement. A round counts as engaged if
you conquered at least one territory or made at least 3 attacks that round.
Bot takeover & pacts: when a human is converted to a bot, all of that player's
pacts are automatically broken.
See also: Ranked & RP · Game Modes Overview · Match Settings