Idle Zoo is a management idler about building a zoo visitors want to come to: you add enclosures, stock them with animals, and the ticket income funds the next expansion.
Rarer animals draw more visitors, so the progression is a straightforward loop of unlocking something impressive and watching the queue at the gate grow.
By attracting more visitors, which means rarer and more impressive animals rather than simply more of them.
Yes — the zoo keeps taking money while the tab is closed.
Yes — a friendly management game with no violence.