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Without DNS, players join a server with IP:port. With a DNS zone handed to Kuro, each server gets a name: survival.play.example.com.

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What Kuro publishes

The port stays in the address (survival.play.example.com:25568), since several servers share a node’s IP. Games that read an SRV record, like Minecraft Java, do without it: the player only types the name. Kuro never touches a record it did not create, and recreates the ones deleted by hand.
A dedicated domain. At Cloudflare, an API token covers a whole zone. Use a domain for game servers that is separate from your website’s: a stolen token could then change nothing on your site or your other services.

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Cloudflare

1

Create the token

My Profile › API Tokens › Create Token, “Edit zone DNS” template.
2

Limit its permissions

Permissions: Zone › DNS › Edit and Zone › Zone › Read, on this zone only. Optional: restrict the token to the API machine’s IP address.
3

Give it to Kuro

In Kuro, Settings › DNS: Cloudflare provider, server domain (for example play.example.com), token, then Save and Test.
4

Fill in the nodes

On each node’s page, fill in its public address.
Records appear within a minute, as “DNS only” (grey cloud): game traffic does not go through the Cloudflare proxy.